Submission #39034

#	Time	Username	Problem	Language	Result	Execution time	Memory
39034		RockyB	Marriage questions (IZhO14_marriage)	C++14	22 / 100	149 ms	3552 KiB

marriage

/// In The Name Of God

#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,sse3,sse4,popcnt,abm,mmx")

#include <bits/stdc++.h>

#define f first
#define s second

#define pb push_back
#define pp pop_back
#define mp make_pair

#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()

#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);

#define nl '\n'
#define ioi exit(0);

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

const int N = (int)3e4 + 7, inf = (int)1e9 + 7, mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;
const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1}, dy[] = {0, 1, 0, -1, 1, -1, 1, -1};

using namespace std;

int n, m, k;
vector <int> g[N];

int p[N];
bool was[N];
int dfs(int v, int R) {
	if (was[v]) return 0;
	was[v] = 1;
	for (auto to : g[v]) {
		if (!(to <= R)) continue; 
		if (p[to] == -1 || dfs(p[to], R)) {
			p[to] = v;
			return 1;
		}
	}
	return 0;
}
int ok(int R) {
	R += m;
	memset(p, -1, sizeof(p));
	for (int i = 1; i <= m; i++) {
		memset(was, 0, sizeof(was));
		dfs(i, R);
	}
	int cnt = 0, last = -1;
	for (int i = m + 1; i <= n + m; i++) {
		cnt += p[i] != -1;
		if (p[i] != -1 && last == -1) last = i;
		cerr << p[i] << ' ';
	}
	cerr << nl;
	if (cnt == m) return last - (m + 1) + 1;
	return 0;
}
int main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
	#endif
	Kazakhstan
	cin >> n >> m >> k;
	for (int i = 1; i <= k; i++) {
		int a, b;
		cin >> b >> a;
		g[a].pb(b + m);
	}
	for (int i = 1; i <= m; i++) {
		//sort(all(g[i]));
	}
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		ans += ok(i);
	}
	cout << ans;
	ioi
}

• Subtask 1: 22 / 100