結果
| 問題 | No.2543 Many Meetings |
| ユーザー |
 maspy
|
| 提出日時 | 2023-11-24 21:31:04 |
| 言語 | C++23 (gcc 12.3.0 + boost 1.83.0) |
| 結果 |
RE
|
| 実行時間 | - |
| コード長 | 20,989 bytes |
| コンパイル時間 | 5,655 ms |
| コンパイル使用メモリ | 316,616 KB |
| 実行使用メモリ | 45,344 KB |
| 最終ジャッジ日時 | 2024-09-26 08:54:56 |
| 合計ジャッジ時間 | 15,225 ms |
|
ジャッジサーバーID （参考情報） |
judge5 / judge3 |
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テストケース
テストケース表示| 入力 | 結果 | 実行時間 実行使用メモリ |
|---|---|---|
| testcase_00 | AC | 5 ms
19,064 KB |
| testcase_01 | AC | 7 ms
19,060 KB |
| testcase_02 | AC | 7 ms
19,252 KB |
| testcase_03 | RE | - |
| testcase_04 | RE | - |
| testcase_05 | RE | - |
| testcase_06 | RE | - |
| testcase_07 | RE | - |
| testcase_08 | RE | - |
| testcase_09 | RE | - |
| testcase_10 | RE | - |
| testcase_11 | RE | - |
| testcase_12 | RE | - |
| testcase_13 | RE | - |
| testcase_14 | RE | - |
| testcase_15 | RE | - |
| testcase_16 | RE | - |
| testcase_17 | RE | - |
| testcase_18 | RE | - |
| testcase_19 | RE | - |
| testcase_20 | RE | - |
| testcase_21 | RE | - |
| testcase_22 | RE | - |
| testcase_23 | AC | 7 ms
19,328 KB |
| testcase_24 | AC | 7 ms
19,320 KB |
| testcase_25 | AC | 7 ms
19,244 KB |
| testcase_26 | AC | 7 ms
19,328 KB |
| testcase_27 | AC | 7 ms
19,276 KB |
| testcase_28 | AC | 126 ms
45,344 KB |
| testcase_29 | AC | 44 ms
27,860 KB |
| testcase_30 | AC | 45 ms
28,080 KB |
| testcase_31 | AC | 39 ms
26,624 KB |
| testcase_32 | AC | 114 ms
43,720 KB |
| testcase_33 | AC | 6 ms
19,200 KB |
| testcase_34 | AC | 6 ms
19,176 KB |
| testcase_35 | AC | 6 ms
19,260 KB |
| testcase_36 | AC | 5 ms
19,200 KB |
| testcase_37 | AC | 6 ms
19,228 KB |
| testcase_38 | AC | 5 ms
19,136 KB |
| testcase_39 | AC | 5 ms
19,268 KB |
| testcase_40 | AC | 6 ms
19,072 KB |
| testcase_41 | AC | 6 ms
19,328 KB |
| testcase_42 | AC | 7 ms
19,072 KB |
ソースコード
#line 1 "/home/maspy/compro/library/my_template.hpp"
#if defined(LOCAL)
#include <my_template_compiled.hpp>
#else
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using u32 = unsigned int;
using u64 = unsigned long long;
using i128 = __int128;
using u128 = unsigned __int128;
using f128 = __float128;
template <class T>
constexpr T infty = 0;
template <>
constexpr int infty<int> = 1'000'000'000;
template <>
constexpr ll infty<ll> = ll(infty<int>) * infty<int> * 2;
template <>
constexpr u32 infty<u32> = infty<int>;
template <>
constexpr u64 infty<u64> = infty<ll>;
template <>
constexpr i128 infty<i128> = i128(infty<ll>) * infty<ll>;
template <>
constexpr double infty<double> = infty<ll>;
template <>
constexpr long double infty<long double> = infty<ll>;
using pi = pair<ll, ll>;
using vi = vector<ll>;
template <class T>
using vc = vector<T>;
template <class T>
using vvc = vector<vc<T>>;
template <class T>
using vvvc = vector<vvc<T>>;
template <class T>
using vvvvc = vector<vvvc<T>>;
template <class T>
using vvvvvc = vector<vvvvc<T>>;
template <class T>
using pq = priority_queue<T>;
template <class T>
using pqg = priority_queue<T, vector<T>, greater<T>>;
#define vv(type, name, h, ...) \
vector<vector<type>> name(h, vector<type>(__VA_ARGS__))
#define vvv(type, name, h, w, ...) \
vector<vector<vector<type>>> name( \
h, vector<vector<type>>(w, vector<type>(__VA_ARGS__)))
#define vvvv(type, name, a, b, c, ...) \
vector<vector<vector<vector<type>>>> name( \
a, vector<vector<vector<type>>>( \
b, vector<vector<type>>(c, vector<type>(__VA_ARGS__))))
// https://trap.jp/post/1224/
#define FOR1(a) for (ll _ = 0; _ < ll(a); ++_)
#define FOR2(i, a) for (ll i = 0; i < ll(a); ++i)
#define FOR3(i, a, b) for (ll i = a; i < ll(b); ++i)
#define FOR4(i, a, b, c) for (ll i = a; i < ll(b); i += (c))
#define FOR1_R(a) for (ll i = (a)-1; i >= ll(0); --i)
#define FOR2_R(i, a) for (ll i = (a)-1; i >= ll(0); --i)
#define FOR3_R(i, a, b) for (ll i = (b)-1; i >= ll(a); --i)
#define overload4(a, b, c, d, e, ...) e
#define overload3(a, b, c, d, ...) d
#define FOR(...) overload4(__VA_ARGS__, FOR4, FOR3, FOR2, FOR1)(__VA_ARGS__)
#define FOR_R(...) overload3(__VA_ARGS__, FOR3_R, FOR2_R, FOR1_R)(__VA_ARGS__)
#define FOR_subset(t, s) \
for (ll t = (s); t >= 0; t = (t == 0 ? -1 : (t - 1) & (s)))
#define all(x) x.begin(), x.end()
#define len(x) ll(x.size())
#define elif else if
#define eb emplace_back
#define mp make_pair
#define mt make_tuple
#define fi first
#define se second
#define stoi stoll
int popcnt(int x) { return __builtin_popcount(x); }
int popcnt(u32 x) { return __builtin_popcount(x); }
int popcnt(ll x) { return __builtin_popcountll(x); }
int popcnt(u64 x) { return __builtin_popcountll(x); }
int popcnt_mod_2(int x) { return __builtin_parity(x); }
int popcnt_mod_2(u32 x) { return __builtin_parity(x); }
int popcnt_mod_2(ll x) { return __builtin_parityll(x); }
int popcnt_mod_2(u64 x) { return __builtin_parityll(x); }
// (0, 1, 2, 3, 4) -> (-1, 0, 1, 1, 2)
int topbit(int x) { return (x == 0 ? -1 : 31 - __builtin_clz(x)); }
int topbit(u32 x) { return (x == 0 ? -1 : 31 - __builtin_clz(x)); }
int topbit(ll x) { return (x == 0 ? -1 : 63 - __builtin_clzll(x)); }
int topbit(u64 x) { return (x == 0 ? -1 : 63 - __builtin_clzll(x)); }
// (0, 1, 2, 3, 4) -> (-1, 0, 1, 0, 2)
int lowbit(int x) { return (x == 0 ? -1 : __builtin_ctz(x)); }
int lowbit(u32 x) { return (x == 0 ? -1 : __builtin_ctz(x)); }
int lowbit(ll x) { return (x == 0 ? -1 : __builtin_ctzll(x)); }
int lowbit(u64 x) { return (x == 0 ? -1 : __builtin_ctzll(x)); }
template <typename T>
T floor(T a, T b) {
return a / b - (a % b && (a ^ b) < 0);
}
template <typename T>
T ceil(T x, T y) {
return floor(x + y - 1, y);
}
template <typename T>
T bmod(T x, T y) {
return x - y * floor(x, y);
}
template <typename T>
pair<T, T> divmod(T x, T y) {
T q = floor(x, y);
return {q, x - q * y};
}
template <typename T, typename U>
T SUM(const vector<U> &A) {
T sm = 0;
for (auto &&a: A) sm += a;
return sm;
}
#define MIN(v) *min_element(all(v))
#define MAX(v) *max_element(all(v))
#define LB(c, x) distance((c).begin(), lower_bound(all(c), (x)))
#define UB(c, x) distance((c).begin(), upper_bound(all(c), (x)))
#define UNIQUE(x) \
sort(all(x)), x.erase(unique(all(x)), x.end()), x.shrink_to_fit()
template <typename T>
T POP(deque<T> &que) {
T a = que.front();
que.pop_front();
return a;
}
template <typename T>
T POP(pq<T> &que) {
T a = que.top();
que.pop();
return a;
}
template <typename T>
T POP(pqg<T> &que) {
T a = que.top();
que.pop();
return a;
}
template <typename T>
T POP(vc<T> &que) {
T a = que.back();
que.pop_back();
return a;
}
template <typename F>
ll binary_search(F check, ll ok, ll ng, bool check_ok = true) {
if (check_ok) assert(check(ok));
while (abs(ok - ng) > 1) {
auto x = (ng + ok) / 2;
(check(x) ? ok : ng) = x;
}
return ok;
}
template <typename F>
double binary_search_real(F check, double ok, double ng, int iter = 100) {
FOR(iter) {
double x = (ok + ng) / 2;
(check(x) ? ok : ng) = x;
}
return (ok + ng) / 2;
}
template <class T, class S>
inline bool chmax(T &a, const S &b) {
return (a < b ? a = b, 1 : 0);
}
template <class T, class S>
inline bool chmin(T &a, const S &b) {
return (a > b ? a = b, 1 : 0);
}
// ? は -1
vc<int> s_to_vi(const string &S, char first_char) {
vc<int> A(S.size());
FOR(i, S.size()) { A[i] = (S[i] != '?' ? S[i] - first_char : -1); }
return A;
}
template <typename T, typename U>
vector<T> cumsum(vector<U> &A, int off = 1) {
int N = A.size();
vector<T> B(N + 1);
FOR(i, N) { B[i + 1] = B[i] + A[i]; }
if (off == 0) B.erase(B.begin());
return B;
}
// stable sort
template <typename T>
vector<int> argsort(const vector<T> &A) {
vector<int> ids(len(A));
iota(all(ids), 0);
sort(all(ids),
[&](int i, int j) { return (A[i] == A[j] ? i < j : A[i] < A[j]); });
return ids;
}
// A[I[0]], A[I[1]], ...
template <typename T>
vc<T> rearrange(const vc<T> &A, const vc<int> &I) {
vc<T> B(len(I));
FOR(i, len(I)) B[i] = A[I[i]];
return B;
}
#endif
#line 1 "/home/maspy/compro/library/other/io.hpp"
#define FASTIO
#include <unistd.h>
// https://judge.yosupo.jp/submission/21623
namespace fastio {
static constexpr uint32_t SZ = 1 << 17;
char ibuf[SZ];
char obuf[SZ];
char out[100];
// pointer of ibuf, obuf
uint32_t pil = 0, pir = 0, por = 0;
struct Pre {
char num[10000][4];
constexpr Pre() : num() {
for (int i = 0; i < 10000; i++) {
int n = i;
for (int j = 3; j >= 0; j--) {
num[i][j] = n % 10 | '0';
n /= 10;
}
}
}
} constexpr pre;
inline void load() {
memcpy(ibuf, ibuf + pil, pir - pil);
pir = pir - pil + fread(ibuf + pir - pil, 1, SZ - pir + pil, stdin);
pil = 0;
if (pir < SZ) ibuf[pir++] = '\n';
}
inline void flush() {
fwrite(obuf, 1, por, stdout);
por = 0;
}
void rd(char &c) {
do {
if (pil + 1 > pir) load();
c = ibuf[pil++];
} while (isspace(c));
}
void rd(string &x) {
x.clear();
char c;
do {
if (pil + 1 > pir) load();
c = ibuf[pil++];
} while (isspace(c));
do {
x += c;
if (pil == pir) load();
c = ibuf[pil++];
} while (!isspace(c));
}
template <typename T>
void rd_real(T &x) {
string s;
rd(s);
x = stod(s);
}
template <typename T>
void rd_integer(T &x) {
if (pil + 100 > pir) load();
char c;
do
c = ibuf[pil++];
while (c < '-');
bool minus = 0;
if constexpr (is_signed<T>::value || is_same_v<T, i128>) {
if (c == '-') { minus = 1, c = ibuf[pil++]; }
}
x = 0;
while ('0' <= c) { x = x * 10 + (c & 15), c = ibuf[pil++]; }
if constexpr (is_signed<T>::value || is_same_v<T, i128>) {
if (minus) x = -x;
}
}
void rd(int &x) { rd_integer(x); }
void rd(ll &x) { rd_integer(x); }
void rd(i128 &x) { rd_integer(x); }
void rd(u32 &x) { rd_integer(x); }
void rd(u64 &x) { rd_integer(x); }
void rd(u128 &x) { rd_integer(x); }
void rd(double &x) { rd_real(x); }
void rd(long double &x) { rd_real(x); }
void rd(f128 &x) { rd_real(x); }
template <class T, class U>
void rd(pair<T, U> &p) {
return rd(p.first), rd(p.second);
}
template <size_t N = 0, typename T>
void rd_tuple(T &t) {
if constexpr (N < std::tuple_size<T>::value) {
auto &x = std::get<N>(t);
rd(x);
rd_tuple<N + 1>(t);
}
}
template <class... T>
void rd(tuple<T...> &tpl) {
rd_tuple(tpl);
}
template <size_t N = 0, typename T>
void rd(array<T, N> &x) {
for (auto &d: x) rd(d);
}
template <class T>
void rd(vc<T> &x) {
for (auto &d: x) rd(d);
}
void read() {}
template <class H, class... T>
void read(H &h, T &... t) {
rd(h), read(t...);
}
void wt(const char c) {
if (por == SZ) flush();
obuf[por++] = c;
}
void wt(const string s) {
for (char c: s) wt(c);
}
void wt(const char *s) {
size_t len = strlen(s);
for (size_t i = 0; i < len; i++) wt(s[i]);
}
template <typename T>
void wt_integer(T x) {
if (por > SZ - 100) flush();
if (x < 0) { obuf[por++] = '-', x = -x; }
int outi;
for (outi = 96; x >= 10000; outi -= 4) {
memcpy(out + outi, pre.num[x % 10000], 4);
x /= 10000;
}
if (x >= 1000) {
memcpy(obuf + por, pre.num[x], 4);
por += 4;
} else if (x >= 100) {
memcpy(obuf + por, pre.num[x] + 1, 3);
por += 3;
} else if (x >= 10) {
int q = (x * 103) >> 10;
obuf[por] = q | '0';
obuf[por + 1] = (x - q * 10) | '0';
por += 2;
} else
obuf[por++] = x | '0';
memcpy(obuf + por, out + outi + 4, 96 - outi);
por += 96 - outi;
}
template <typename T>
void wt_real(T x) {
ostringstream oss;
oss << fixed << setprecision(15) << double(x);
string s = oss.str();
wt(s);
}
void wt(int x) { wt_integer(x); }
void wt(ll x) { wt_integer(x); }
void wt(i128 x) { wt_integer(x); }
void wt(u32 x) { wt_integer(x); }
void wt(u64 x) { wt_integer(x); }
void wt(u128 x) { wt_integer(x); }
void wt(double x) { wt_real(x); }
void wt(long double x) { wt_real(x); }
void wt(f128 x) { wt_real(x); }
template <class T, class U>
void wt(const pair<T, U> val) {
wt(val.first);
wt(' ');
wt(val.second);
}
template <size_t N = 0, typename T>
void wt_tuple(const T t) {
if constexpr (N < std::tuple_size<T>::value) {
if constexpr (N > 0) { wt(' '); }
const auto x = std::get<N>(t);
wt(x);
wt_tuple<N + 1>(t);
}
}
template <class... T>
void wt(tuple<T...> tpl) {
wt_tuple(tpl);
}
template <class T, size_t S>
void wt(const array<T, S> val) {
auto n = val.size();
for (size_t i = 0; i < n; i++) {
if (i) wt(' ');
wt(val[i]);
}
}
template <class T>
void wt(const vector<T> val) {
auto n = val.size();
for (size_t i = 0; i < n; i++) {
if (i) wt(' ');
wt(val[i]);
}
}
void print() { wt('\n'); }
template <class Head, class... Tail>
void print(Head &&head, Tail &&... tail) {
wt(head);
if (sizeof...(Tail)) wt(' ');
print(forward<Tail>(tail)...);
}
// gcc expansion. called automaticall after main.
void __attribute__((destructor)) _d() { flush(); }
} // namespace fastio
using fastio::read;
using fastio::print;
using fastio::flush;
#define INT(...) \
int __VA_ARGS__; \
read(__VA_ARGS__)
#define LL(...) \
ll __VA_ARGS__; \
read(__VA_ARGS__)
#define U32(...) \
u32 __VA_ARGS__; \
read(__VA_ARGS__)
#define U64(...) \
u64 __VA_ARGS__; \
read(__VA_ARGS__)
#define STR(...) \
string __VA_ARGS__; \
read(__VA_ARGS__)
#define CHAR(...) \
char __VA_ARGS__; \
read(__VA_ARGS__)
#define DBL(...) \
double __VA_ARGS__; \
read(__VA_ARGS__)
#define VEC(type, name, size) \
vector<type> name(size); \
read(name)
#define VV(type, name, h, w) \
vector<vector<type>> name(h, vector<type>(w)); \
read(name)
void YES(bool t = 1) { print(t ? "YES" : "NO"); }
void NO(bool t = 1) { YES(!t); }
void Yes(bool t = 1) { print(t ? "Yes" : "No"); }
void No(bool t = 1) { Yes(!t); }
void yes(bool t = 1) { print(t ? "yes" : "no"); }
void no(bool t = 1) { yes(!t); }
#line 2 "/home/maspy/compro/library/ds/segtree/dynamic_segtree.hpp"
// sparse もあるので状況によってはそっちで
template <typename Monoid, bool PERSISTENT, int NODES>
struct Dynamic_SegTree {
using MX = Monoid;
using X = typename MX::value_type;
using F = function<X(ll, ll)>;
F default_prod;
struct Node {
Node *l, *r;
X x;
};
const ll L0, R0;
Node *pool;
int pid;
using np = Node *;
Dynamic_SegTree(
ll L0, ll R0, F default_prod = [](ll l, ll r) -> X { return MX::unit(); })
: default_prod(default_prod), L0(L0), R0(R0), pid(0) {
pool = new Node[NODES];
}
np new_root() { return new_node(L0, R0); }
np new_node(const X x) {
pool[pid].l = pool[pid].r = nullptr;
pool[pid].x = x;
return &(pool[pid++]);
}
np new_node(ll l, ll r) { return new_node(default_prod(l, r)); }
np new_node() { return new_node(L0, R0); }
np new_node(const vc<X> &dat) {
assert(L0 == 0 && R0 == len(dat));
auto dfs = [&](auto &dfs, ll l, ll r) -> Node * {
if (l == r) return nullptr;
if (r == l + 1) return new_node(dat[l]);
ll m = (l + r) / 2;
np l_root = dfs(dfs, l, m), r_root = dfs(dfs, m, r);
X x = MX::op(l_root->x, r_root->x);
np root = new_node(x);
root->l = l_root, root->r = r_root;
return root;
};
return dfs(dfs, 0, len(dat));
}
X prod(np root, ll l, ll r) {
assert(L0 <= l && l <= r && r <= R0);
if (!root || l == r) return MX::unit();
X x = MX::unit();
prod_rec(root, L0, R0, l, r, x);
return x;
}
np set(np root, ll i, const X &x) {
assert(root && L0 <= i && i < R0);
return set_rec(root, L0, R0, i, x);
}
np multiply(np root, ll i, const X &x) {
assert(root && L0 <= i && i < R0);
return multiply_rec(root, L0, R0, i, x);
}
template <typename F>
ll max_right(np root, F check, ll L) {
assert(pid && root && L0 <= L && L <= R0 && check(MX::unit()));
X x = MX::unit();
return max_right_rec(root, check, L0, R0, L, x);
}
template <typename F>
ll min_left(np root, F check, ll R) {
assert(pid && L0 <= R && R <= R0 && check(MX::unit()));
X x = MX::unit();
return min_left_rec(root, check, L0, R0, R, x);
}
// (idx, val)
template <typename F>
void enumerate(np root, F f) {
if (!root) return;
auto dfs = [&](auto &dfs, np c, ll l, ll r) -> void {
if (!c) return;
if (r - l == 1) {
f(l, c->x);
return;
}
ll m = (l + r) / 2;
dfs(dfs, c->l, l, m);
dfs(dfs, c->r, m, r);
};
dfs(dfs, root, L0, R0);
return;
}
void reset() { pid = 0; }
private:
np copy_node(np c) {
if (!c || !PERSISTENT) return c;
pool[pid].l = c->l, pool[pid].r = c->r;
pool[pid].x = c->x;
return &(pool[pid++]);
}
np set_rec(np c, ll l, ll r, ll i, const X &x) {
if (r == l + 1) {
c = copy_node(c);
c->x = x;
return c;
}
ll m = (l + r) / 2;
c = copy_node(c);
if (i < m) {
if (!c->l) c->l = new_node(l, m);
c->l = set_rec(c->l, l, m, i, x);
} else {
if (!c->r) c->r = new_node(m, r);
c->r = set_rec(c->r, m, r, i, x);
}
X xl = (c->l ? c->l->x : default_prod(l, m));
X xr = (c->r ? c->r->x : default_prod(m, r));
c->x = MX::op(xl, xr);
return c;
}
np multiply_rec(np c, ll l, ll r, ll i, const X &x, bool make_copy = true) {
if (r == l + 1) {
if (make_copy) c = copy_node(c);
c->x = MX::op(c->x, x);
return c;
}
ll m = (l + r) / 2;
if (make_copy) c = copy_node(c);
if (i < m) {
bool make = true;
if (!c->l) c->l = new_node(l, m), make = false;
c->l = multiply_rec(c->l, l, m, i, x, make);
} else {
bool make = true;
if (!c->r) c->r = new_node(m, r), make = false;
c->r = multiply_rec(c->r, m, r, i, x, make);
}
X xl = (c->l ? c->l->x : default_prod(l, m));
X xr = (c->r ? c->r->x : default_prod(m, r));
c->x = MX::op(xl, xr);
return c;
}
void prod_rec(np c, ll l, ll r, ll ql, ll qr, X &x) {
chmax(ql, l);
chmin(qr, r);
if (ql >= qr) return;
if (!c) {
x = MX::op(x, default_prod(ql, qr));
return;
}
if (l == ql && r == qr) {
x = MX::op(x, c->x);
return;
}
ll m = (l + r) / 2;
prod_rec(c->l, l, m, ql, qr, x);
prod_rec(c->r, m, r, ql, qr, x);
}
template <typename F>
ll max_right_rec(np c, const F &check, ll l, ll r, ll ql, X &x) {
if (r <= ql) return R0;
if (ql <= l && check(MX::op(x, c->x))) {
x = MX::op(x, c->x);
return R0;
}
if (r == l + 1) return l;
ll m = (l + r) / 2;
if (!c->l) c->l = new_node(l, m);
ll k = max_right_rec(c->l, check, l, m, ql, x);
if (k != R0) return k;
if (!c->r) c->r = new_node(m, r);
return max_right_rec(c->r, check, m, r, ql, x);
}
template <typename F>
ll min_left_rec(np c, const F &check, ll l, ll r, ll qr, X &x) {
if (qr <= l) return L0;
if (r <= qr && check(MX::op(c->x, x))) {
x = MX::op(x, c->x);
return L0;
}
if (r == l + 1) return r;
ll m = (l + r) / 2;
if (!c->r) c->r = new_node(m, r);
ll k = min_left_rec(c->r, check, m, r, qr, x);
if (k != L0) return k;
if (!c->l) c->l = new_node(l, m);
return min_left_rec(c->l, check, l, m, qr, x);
}
};
#line 2 "/home/maspy/compro/library/alg/monoid/min_idx.hpp"
template <typename T, bool tie_is_left = true>
struct Monoid_Min_Idx {
using value_type = pair<T, int>;
using X = value_type;
static constexpr bool is_small(const X& x, const X& y) {
if (x.fi < y.fi) return true;
if (x.fi > y.fi) return false;
return (tie_is_left ? (x.se < y.se) : (x.se >= y.se));
}
static X op(X x, X y) { return (is_small(x, y) ? x : y); }
static constexpr X unit() { return {infty<T>, -1}; }
static constexpr bool commute = true;
};
#line 2 "/home/maspy/compro/library/alg/monoid/add.hpp"
template <typename X>
struct Monoid_Add {
using value_type = X;
static constexpr X op(const X &x, const X &y) noexcept { return x + y; }
static constexpr X inverse(const X &x) noexcept { return -x; }
static constexpr X power(const X &x, ll n) noexcept { return X(n) * x; }
static constexpr X unit() { return X(0); }
static constexpr bool commute = true;
};
#line 2 "/home/maspy/compro/library/ds/doubling.hpp"
// 状態 a から 1 回操作すると、状態 b に遷移し、モノイドの元 x を加える。
// 行き先がない場合：-1 （add 不要）
template <typename Monoid, int LOG>
struct Doubling {
using X = typename Monoid::value_type;
int N;
bool is_prepared;
vvc<int> TO;
vvc<X> DP;
Doubling(int N) : N(N), is_prepared(0) {
TO.assign(LOG, vc<int>(N, -1));
DP.assign(LOG, vc<X>(N, Monoid::unit()));
}
void add(int i, int to, X x) {
assert(!is_prepared);
assert(-1 <= to && to < N);
TO[0][i] = to;
DP[0][i] = x;
}
void build() {
assert(!is_prepared);
is_prepared = 1;
FOR(k, LOG - 1) {
FOR(v, N) {
int w = TO[k][v];
if (w == -1) {
TO[k + 1][v] = -1;
DP[k + 1][v] = DP[k][v];
continue;
}
TO[k + 1][v] = TO[k][w];
DP[k + 1][v] = Monoid::op(DP[k][v], DP[k][w]);
}
}
}
// (to, val)
pair<int, X> calc(int i, ll step) {
assert(is_prepared);
assert(step < (1LL << LOG));
X x = Monoid::unit();
FOR(k, LOG) {
if (i == -1) break;
if (step & 1LL << k) {
x = Monoid::op(x, DP[k][i]);
i = TO[k][i];
}
}
return {i, x};
}
template <typename F>
ll max_step(F check, int i) {
assert(is_prepared);
X x = Monoid::unit();
ll step = 0;
assert(check(x));
FOR_R(k, LOG) {
int j = TO[k][i];
X y = Monoid::op(x, DP[k][i]);
if (check(y)) {
step |= 1LL << k;
i = j;
x = y;
assert(i != -1);
}
}
return step;
}
void debug() {
print("TO");
FOR(k, LOG) print(TO[k]);
print("DP");
FOR(k, LOG) print(DP[k]);
}
};
#line 6 "main.cpp"
void solve() {
LL(N, K);
vi L(N), R(N);
FOR(i, N) read(L[i], R[i]);
auto I = argsort(R);
L = rearrange(L, I);
R = rearrange(R, I);
Dynamic_SegTree<Monoid_Min_Idx<ll>, 0, 500000> seg(-10, infty<int> + 10);
auto root = seg.new_root();
FOR(i, N) { root = seg.multiply(root, L[i], {R[i], i}); }
Doubling<Monoid_Add<int>, 20> X(N + 1);
X.add(N, N, 1);
FOR(i, N) {
auto [r, j] = seg.prod(root, R[i], infty<int> + 10);
if (j == -1) {
X.add(i, N, 1);
} else {
X.add(i, j, 1);
}
}
X.build();
ll ANS = infty<ll>;
FOR(i, N) {
auto [j, x] = X.calc(i, K - 1);
if (j == N) continue;
chmin(ANS, R[j] - L[i]);
}
if (ANS == infty<ll>) ANS = -1;
print(ANS);
}
signed main() {
int T = 1;
// INT(T);
FOR(T) solve();
return 0;
}