Submission #574077

#	Time	Username	Problem	Language	Result	Execution time	Memory
574077		vovamr	Marriage questions (IZhO14_marriage)	C++17	86 / 100	1240 ms	3512 KiB

marriage

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define fi first
#define se second
#define ll long long
#define ld long double
#define sz(x) ((int)(x).size())
#define all(x) 	(x).begin(), (x).end()
#define pb push_back
#define mpp make_pair
#define ve vector
using namespace std;
using namespace __gnu_pbds;
template<class T> using oset = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
const ll inf = 1e18; const int iinf = 1e9;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T> inline bool chmin(T& a, T b) { return (a > b ? a = b, 1 : 0); }
template <typename T> inline bool chmax(T& a, T b) { return (a < b ? a = b, 1 : 0); }

int timer = 1;
const int N = 3e4 + 10;
const int M = 2e3 + 10;

ve<int> gr[N + M];
bool can[N]; int used[M], mt[N + M];

inline bool kuhn(int v) {
	if (used[v] == timer) return 0;
	used[v] = timer;
	for (int &to : gr[v]) if (can[to] && mt[to] == -1) { mt[to] = v, mt[v] = to; return 1; }
	for (int &to : gr[v]) if (can[to] && kuhn(mt[to])) { mt[to] = v, mt[v] = to; return 1; }
	return 0;
}

int un[N];
int ptr = 0;

int sz = 0;
inline void run() {
	while (ptr) {
		++timer;
		bool ok = kuhn(un[ptr - 1]);
		if (!ok) break;
		else --ptr, ++sz;
	}
}

inline void solve() {
	int n, m, k;
	cin >> n >> m >> k;
	for (int i = 0; i < k; ++i) {
		int v, u;
		cin >> v >> u, --v, --u;
		gr[u].pb(v + m);
	}

	for (int i = 0; i < n + m; ++i) mt[i] = -1;
	for (int i = 0; i < m; ++i) un[ptr++] = i;

	int ans = 0;
	for (int l = 0, r = 0; l < n; ++l) {
		while (r < n) {
			can[r + m] = 1; run();
			if (sz == m) break;
			++r;
		}

		ans += n - r;

		can[l + m] = 0;
		if (mt[l + m] != -1) {
			--sz;
			mt[mt[l + m]] = -1;
			un[ptr++] = mt[l + m];
			mt[l + m] = -1;
		}
	}
	cout << ans;
}

signed main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	int q = 1; // cin >> q;
	while (q--) solve();
	cerr << fixed << setprecision(3) << "Time execution: " << (double)clock() / CLOCKS_PER_SEC << endl;
}

• Subtask 1: 86 / 100