結果

問題 No.1803 Remainder of Sum
ユーザー ecottea
提出日時 2024-05-19 19:35:59
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 35 ms / 2,000 ms
コード長 9,728 bytes
コンパイル時間 4,409 ms
コンパイル使用メモリ 268,000 KB
最終ジャッジ日時 2025-02-21 16:04:09
ジャッジサーバーID
(参考情報)
judge3 / judge2
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ファイルパターン 結果
sample AC * 1
other AC * 8
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ソースコード

diff #
プレゼンテーションモードにする

#ifndef HIDDEN_IN_VS //
//
#define _CRT_SECURE_NO_WARNINGS
//
#include <bits/stdc++.h>
using namespace std;
//
using ll = long long; using ull = unsigned long long; // -2^63 2^63 = 9 * 10^18int -2^31 2^31 = 2 * 10^9
using pii = pair<int, int>; using pll = pair<ll, ll>; using pil = pair<int, ll>; using pli = pair<ll, int>;
using vi = vector<int>; using vvi = vector<vi>; using vvvi = vector<vvi>; using vvvvi = vector<vvvi>;
using vl = vector<ll>; using vvl = vector<vl>; using vvvl = vector<vvl>; using vvvvl = vector<vvvl>;
using vb = vector<bool>; using vvb = vector<vb>; using vvvb = vector<vvb>;
using vc = vector<char>; using vvc = vector<vc>; using vvvc = vector<vvc>;
using vd = vector<double>; using vvd = vector<vd>; using vvvd = vector<vvd>;
template <class T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
using Graph = vvi;
//
const double PI = acos(-1);
int DX[4] = {1, 0, -1, 0}; // 4
int DY[4] = {0, 1, 0, -1};
int INF = 1001001001; ll INFL = 4004004003094073385LL; // (int)INFL = INF, (int)(-INFL) = -INF;
//
struct fast_io { fast_io() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(18); } } fastIOtmp;
//
#define all(a) (a).begin(), (a).end()
#define sz(x) ((int)(x).size())
#define lbpos(a, x) (int)distance((a).begin(), std::lower_bound(all(a), x))
#define ubpos(a, x) (int)distance((a).begin(), std::upper_bound(all(a), x))
#define Yes(b) {cout << ((b) ? "Yes\n" : "No\n");}
#define rep(i, n) for(int i = 0, i##_len = int(n); i < i##_len; ++i) // 0 n-1
#define repi(i, s, t) for(int i = int(s), i##_end = int(t); i <= i##_end; ++i) // s t
#define repir(i, s, t) for(int i = int(s), i##_end = int(t); i >= i##_end; --i) // s t
#define repe(v, a) for(const auto& v : (a)) // a
#define repea(v, a) for(auto& v : (a)) // a
#define repb(set, d) for(int set = 0, set##_ub = 1 << int(d); set < set##_ub; ++set) // d
#define repis(i, set) for(int i = lsb(set), bset##i = set; i >= 0; bset##i -= 1 << i, i = lsb(bset##i)) // set
#define repp(a) sort(all(a)); for(bool a##_perm = true; a##_perm; a##_perm = next_permutation(all(a))) // a
#define uniq(a) {sort(all(a)); (a).erase(unique(all(a)), (a).end());} //
#define EXIT(a) {cout << (a) << endl; exit(0);} //
#define inQ(x, y, u, l, d, r) ((u) <= (x) && (l) <= (y) && (x) < (d) && (y) < (r)) //
//
template <class T> inline ll powi(T n, int k) { ll v = 1; rep(i, k) v *= n; return v; }
template <class T> inline bool chmax(T& M, const T& x) { if (M < x) { M = x; return true; } return false; } // true
    
template <class T> inline bool chmin(T& m, const T& x) { if (m > x) { m = x; return true; } return false; } // true
    
template <class T> inline T getb(T set, int i) { return (set >> i) & T(1); }
template <class T> inline T smod(T n, T m) { n %= m; if (n < 0) n += m; return n; } // mod
//
template <class T, class U> inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template <class T> inline istream& operator>>(istream& is, vector<T>& v) { repea(x, v) is >> x; return is; }
template <class T> inline vector<T>& operator--(vector<T>& v) { repea(x, v) --x; return v; }
template <class T> inline vector<T>& operator++(vector<T>& v) { repea(x, v) ++x; return v; }
#endif //
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#ifdef _MSC_VER
#include "localACL.hpp"
#endif
using mint = modint1000000007;
//using mint = modint998244353;
//using mint = modint; // mint::set_mod(m);
namespace atcoder {
inline istream& operator>>(istream& is, mint& x) { ll x_; is >> x_; x = x_; return is; }
inline ostream& operator<<(ostream& os, const mint& x) { os << x.val(); return os; }
}
using vm = vector<mint>; using vvm = vector<vm>; using vvvm = vector<vvm>; using vvvvm = vector<vvvm>; using pim = pair<int, mint>;
#endif
#ifdef _MSC_VER // Visual Studio
#include "local.hpp"
#else // gcc
inline int popcount(int n) { return __builtin_popcount(n); }
inline int popcount(ll n) { return __builtin_popcountll(n); }
inline int lsb(int n) { return n != 0 ? __builtin_ctz(n) : -1; }
inline int lsb(ll n) { return n != 0 ? __builtin_ctzll(n) : -1; }
template <size_t N> inline int lsb(const bitset<N>& b) { return b._Find_first(); }
inline int msb(int n) { return n != 0 ? (31 - __builtin_clz(n)) : -1; }
inline int msb(ll n) { return n != 0 ? (63 - __builtin_clzll(n)) : -1; }
#define dump(...)
#define dumpel(v)
#define dump_list(v)
#define dump_mat(v)
#define input_from_file(f)
#define output_to_file(f)
#define Assert(b) { if (!(b)) { vc MLE(1<<30); EXIT(MLE.back()); } } // RE MLE
#endif
ll WA(ll n, ll m) {
ll res = 0;
if (n >= m) {
ll k = m / 2;
res = k * (k + 1) / 2;
}
else {
ll k = m / 2;
res = k * (k + 1) / 2 - 1 + (k - 1);
}
return res;
}
ll naive(ll n, ll m) {
// dp[set] : set 使
vl dp(1LL << m, INFL);
rep(i, m) dp[1LL << i] = 0;
vi prv(1LL << m);
repb(set, m) {
repis(i, set) {
repis(j, set) {
if (j == i) continue;
int pset = set - (1 << j);
if (chmin(dp[set], dp[pset] + (i + j) % m)) {
prv[set] = pset;
}
}
}
}
// dump(dp);
int ini = 0;
repi(i, 1, n) {
ini |= 1 << (i % m);
}
return dp[ini];
}
void zikken() {
repi(n, 2, 10){
cout << "n=" << n << " : ";
repi(m, 1, 2 * n) {
cout << naive(n, m) << " ";
}
cout << endl;
}
exit(0);
}
/*
n=2 : 0 1 0 3
n=3 : 0 1 1 1 3 7
n=4 : 0 1 1 2 1 4 7 12
n=5 : 0 1 1 2 2 2 4 8 12 18
n=6 : 0 1 1 2 2 3 2 5 8 13 18 25
n=7 : 0 1 1 2 2 3 3 3 5 9 13 19 25 33
n=8 : 0 1 1 2 2 3 3 4 3 6 9 14 19 26 33 42
n=9 : 0 1 1 2 2 3 3 4 4 4 6 10 14 20 26 34 42 52
n=10 : 0 1 1 2 2 3 3 4 4 5 4 7 10 15 20 27 34 43 52 63
n=6, m=7
1 2 3 4 5 6 0
o o o o o o 0
o o o x o o 0 (3+4=0)
o o x o o 1 (5+3=1)
o o x o 1 (2+5=0)
o x o 2 (6+2=1)
o x 2 (1+6=0)
*/
//
/*
* to :
* cost :
*/
struct WEdge {
// verify : https://judge.yosupo.jp/problem/shortest_path
int to; //
ll cost; //
WEdge() : to(-1), cost(-INFL) {}
WEdge(int to, ll cost) : to(to), cost(cost) {}
//
operator int() const { return to; }
#ifdef _MSC_VER
friend ostream& operator<<(ostream& os, const WEdge& e) {
os << '(' << e.to << ',' << e.cost << ')';
return os;
}
#endif
};
//
/*
* WGraph g
* g[v] : v
*
* verify : https://judge.yosupo.jp/problem/shortest_path
*/
using WGraph = vector<vector<WEdge>>;
//O(m log n)
/*
* g
* msf rs
*/
ll kruskal(const WGraph& g, WGraph* msf = nullptr, vi* rs = nullptr) {
// verify : https://judge.yosupo.jp/problem/minimum_spanning_tree
int n = sz(g);
if (msf != nullptr) *msf = WGraph(n);
//
priority_queue_rev<tuple<ll, int, int>> q;
rep(s, n) repe(e, g[s]) q.push({ e.cost, s, e.to });
ll cost = 0; //
dsu d(n); //
while (!q.empty()) {
auto [c, s, t] = q.top(); q.pop();
//
if (d.same(s, t)) continue;
//
cost += c;
d.merge(s, t);
if (msf != nullptr) {
(*msf)[s].push_back({ t, c });
(*msf)[t].push_back({ s, c });
}
}
//
if (rs != nullptr) {
rs->clear();
repe(tmp, d.groups()) rs->push_back(tmp[0]);
}
return cost;
}
ll TLE(ll n, ll m) {
chmin(n, m);
WGraph g(n + 1);
repi(i, 1, n) repi(j, 1, n) {
if (i == j) continue;
g[i].push_back({ j, (i + j) % m });
}
return kruskal(g);
}
void check() {
repi(n, 2, 10) {
repi(m, 1, 2 * n) {
auto res_naive = naive(n, m);
auto res_TLE = TLE(n, m);
if (res_naive != res_TLE) {
cout << n << " " << m << endl;
cout << res_naive << endl;
cout << res_TLE << endl;
}
}
}
exit(0);
}
ll solve(ll n, ll m) {
ll r = min(n, m);
ll l = m - r;
ll res = r - l + 1 - 1 - (r - l + 1) / 2;
if (l > 0) res += (l + 4) * (l - 1) / 2;
return res;
}
void check2() {
repi(n, 2, 10) {
repi(m, 1, 2 * n) {
auto res_solve = solve(n, m);
auto res_TLE = TLE(n, m);
if (res_solve != res_TLE) {
dump("---------");
cout << n << " " << m << endl;
cout << res_solve << endl;
cout << res_TLE << endl;
}
}
}
exit(0);
}
void Main() {
ll n, m;
cin >> n >> m;
dump(naive(n, m)); dump("----");
cout << solve(n, m) << "\n";
}
int main() {
// input_from_file("input.txt");
// output_to_file("output.txt");
// zikken();
// check2();
int t = 1;
cin >> t; //
while (t--) {
dump("------------------------------");
Main();
}
}
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