제출 #392537

#제출 시각아이디문제언어결과실행 시간메모리
392537patrikpavic2결혼 문제 (IZhO14_marriage)C++17
72 / 100
1596 ms12168 KiB
#include <cstdio>
#include <cstring>
#include <vector>

#define PB push_back

using namespace std;

typedef long long ll;

const int N = (1 << 15);

int par[N], n, m, bio[N], k, un[N];
vector < int > v[N], pos;

bool dodaj(int x){
	if(bio[x]) return 0;
	bio[x] = 1; pos.PB(x);
	for(int y : v[x]){
		if(un[y] && (par[y] == -1 || dodaj(par[y]))){
			par[x] = y; par[y] = x;
			return 1;
		}
	}
	return 0;
}

int main(){
	scanf("%d%d%d", &n, &m, &k);
	for(int i = 0;i < k;i++){
		int a, b; scanf("%d%d", &a, &b);
		a--; b--;
		v[a].PB(n + b), v[b + n].PB(a);
		//printf("VEZA %d %d\n", a, b + n);
	}
	memset(par, -1, sizeof(par));
	for(int i = 0;i < m;i++) un[i + n] = 1;
	int r = 0, sol = 0;
	ll ans = 0;
	for(int l = 0;l < n;l++){
		if(l){
			un[l - 1] = 0;
			if(par[l - 1] != -1){
				sol--; par[par[l - 1]] = -1;
				sol += dodaj(par[l - 1]);
				for(int x : pos) bio[x] = 0;
			}
		}		
		while(r < n && sol < m){
			un[r] = 1; sol += dodaj(r);
			for(int x : pos) bio[x] = 0;
			r++;
		}
		//printf("l = %d r = %d sol = %d\n", l, r, sol);
		ans += (n + 1 - r) * (sol == m);
	}
	printf("%lld\n", ans);
	return 0;
}


컴파일 시 표준 에러 (stderr) 메시지

marriage.cpp: In function 'int main()':
marriage.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |  scanf("%d%d%d", &n, &m, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
marriage.cpp:31:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |   int a, b; scanf("%d%d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~
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