Submission #456280

#	Time	Username	Problem	Language	Result	Execution time	Memory
456280		grt	Skandi (COCI20_skandi)	C++17	0 / 110	277 ms	524292 KiB

Main

#include <bits/stdc++.h>
#define ST first
#define ND second
#define PB push_back

using namespace std;
using ll = long long;
using pi = pair<int,int>;
using vi = vector<int>;

const int nax = 510;
int n, m;
char t[nax][nax];
int lft[nax][nax], up[nax][nax];
vi V[nax * nax * 2];
bool vis[nax * nax * 2];
int match[nax * nax * 2];


bool aug(int x) {
	vis[x] = true;
	for(int nbh : V[x]) if(match[nbh] == -1) {
		match[x] = nbh;
		match[nbh] = x;
		return true;
	}
	for(int nbh : V[x]) if(!vis[nbh]) {
		if(aug(match[nbh])) {
			match[x] = nbh;
			match[nbh] = x;
			return true;
		}
	}
	return false;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m;
	for(int i = 0; i < n; ++i) {
		for(int j = 0; j < m; ++j) {
			cin >> t[i][j];
			if(t[i][j] == '1') {
				lft[i][j] = i * m + j;
				up[i][j] = i * m + j;
			} else {
				lft[i][j] = lft[i][j - 1];
				up[i][j] = up[i - 1][j];
				V[up[i][j]].PB(lft[i][j] + n * m);
				V[lft[i][j] + n * m].PB(up[i][j]);
			}
		}
	}
	for(int i = 0; i < n * m * 2; ++i) match[i] = -1;
	while(true) {
		for(int i = 0; i < n * m * 2; ++i) vis[i] = false;
		bool any = false;
		for(int i = 0; i < n * m * 2; ++i) {
			if(!vis[i] && match[i] == -1 && aug(i)) any = true;
		}
		if(any) break;
	}
	int ans = 0;
	for(int i = 0; i < n * m; ++i) {
		ans += match[i] != -1;
	}
	cout << ans;
}

• Subtask 1: 0 / 18
• Subtask 2: 0 / 32
• Subtask 3: 0 / 60