結果
問題 | No.1244 Black Segment |
ユーザー |
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提出日時 | 2020-10-03 19:45:06 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 89 ms / 2,000 ms |
コード長 | 3,646 bytes |
コンパイル時間 | 1,463 ms |
コンパイル使用メモリ | 120,028 KB |
実行使用メモリ | 82,504 KB |
最終ジャッジ日時 | 2024-07-18 04:59:39 |
合計ジャッジ時間 | 5,143 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 36 |
ソースコード
#include<iostream>#include<string>#include<cstdio>#include<vector>#include<cmath>#include<algorithm>#include<functional>#include<iomanip>#include<queue>#include<ciso646>#include<random>#include<map>#include<set>#include<bitset>#include<stack>#include<unordered_map>#include<utility>#include<cassert>#include<complex>#include<numeric>#include<array>using namespace std;//#define int long longtypedef long long ll;typedef unsigned long long ul;typedef unsigned int ui;constexpr ll mod = 998244353;const ll INF = mod * mod;typedef pair<int, int>P;#define stop char nyaa;cin>>nyaa;#define rep(i,n) for(int i=0;i<n;i++)#define per(i,n) for(int i=n-1;i>=0;i--)#define Rep(i,sta,n) for(int i=sta;i<n;i++)#define rep1(i,n) for(int i=1;i<=n;i++)#define per1(i,n) for(int i=n;i>=1;i--)#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)#define all(v) (v).begin(),(v).end()typedef pair<ll, ll> LP;typedef long double ld;typedef pair<ld, ld> LDP;const ld eps = 1e-12;const ld pi = acosl(-1.0);ll mod_pow(ll x, ll n, ll m = mod) {ll res = 1;while (n) {if (n & 1)res = res * x % m;x = x * x % m; n >>= 1;}return res;}struct modint {ll n;modint() :n(0) { ; }modint(ll m) :n(m) {if (n >= mod)n %= mod;else if (n < 0)n = (n % mod + mod) % mod;}operator int() { return n; }};bool operator==(modint a, modint b) { return a.n == b.n; }modint operator+=(modint& a, modint b) { a.n += b.n; if (a.n >= mod)a.n -= mod; return a; }modint operator-=(modint& a, modint b) { a.n -= b.n; if (a.n < 0)a.n += mod; return a; }modint operator*=(modint& a, modint b) { a.n = ((ll)a.n * b.n) % mod; return a; }modint operator+(modint a, modint b) { return a += b; }modint operator-(modint a, modint b) { return a -= b; }modint operator*(modint a, modint b) { return a *= b; }modint operator^(modint a, ll n) {if (n == 0)return modint(1);modint res = (a * a) ^ (n / 2);if (n % 2)res = res * a;return res;}ll inv(ll a, ll p) {return (a == 1 ? 1 : (1 - p * inv(p % a, a)) / a + p);}modint operator/(modint a, modint b) { return a * modint(inv(b, mod)); }const int max_n = 1 << 22;modint fact[max_n], factinv[max_n];void init_f() {fact[0] = modint(1);for (int i = 0; i < max_n - 1; i++) {fact[i + 1] = fact[i] * modint(i + 1);}factinv[max_n - 1] = modint(1) / fact[max_n - 1];for (int i = max_n - 2; i >= 0; i--) {factinv[i] = factinv[i + 1] * modint(i + 1);}}modint comb(int a, int b) {if (a < 0 || b < 0 || a < b)return 0;return fact[a] * factinv[b] * factinv[a - b];}modint calc(int n, int s) {if (n == 0 && s == 0)return 1;else if (n == 0)return 0;return comb(n - 1 + s + s, s) - comb(n - 1 + s + s, s - 1);}vector<int> le[1 << 17];vector<int> ri[1 << 17];void solve() {int n, m, a, b; cin >> n >> m >> a >> b; a--; b--;vector<int> l(m), r(m);rep(i, m) {cin >> l[i] >> r[i]; l[i]--; r[i]--;le[l[i]].push_back(r[i] + 1);ri[r[i]+1].push_back(l[i]);}vector<int> dist(n + 1, mod);queue<int> q;rep(i, a + 1) {q.push(i);dist[i] = 0;}while (!q.empty()) {int id = q.front(); q.pop();for (int to : le[id]) {if (dist[id] + 1 < dist[to]) {dist[to] = dist[id] + 1; q.push(to);}}for (int to : ri[id]) {if (dist[id] + 1 < dist[to]) {dist[to] = dist[id] + 1; q.push(to);}}}int ans = mod;for (int i = b + 1; i <= n; i++)ans = min(ans, dist[i]);if (ans == mod)ans = -1;cout << ans << "\n";}signed main() {ios::sync_with_stdio(false);cin.tie(0);//cout << fixed << setprecision(15);//init_f();//init();//expr();//int t; cin >> t; rep(i, t)solve();return 0;}