Submission #393011

#	Time	Username	Problem	Language	Result	Execution time	Memory
393011		patrikpavic2	Marriage questions (IZhO14_marriage)	C++17	100 / 100	1047 ms	3892 KiB

marriage

#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], cookie = 1;
vector < int > v[N];
int jos[N], sz;
 
bool dodaj(int x){
	if(bio[x] == cookie) return 0;
	bio[x] = cookie;
	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);
	}
	memset(par, -1, sizeof(par));
	for(int i = 0;i < m;i++) un[i + n] = 1, jos[i] = i + n;
	sz = m;
	int r = 0;
	ll ans = 0;
	for(int l = 0;l < n;l++){
		if(l){
			un[l - 1] = 0;
			if(par[l - 1] != -1){
				par[par[l - 1]] = -1;
				dodaj(par[l - 1]); cookie++;
				if(par[par[l - 1]] == -1)
					jos[sz++] = par[l - 1];
			}
		}		
		while(r < n && sz > 0){
			un[r] = 1; cookie++;
			while(sz > 0 && dodaj(jos[sz - 1]))
				sz--, cookie++;
			r++;
		}
		ans += (n + 1 - r) * (sz == 0);
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

marriage.cpp: In function 'int main()':
marriage.cpp:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |  scanf("%d%d%d", &n, &m, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
marriage.cpp:32:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |   int a, b; scanf("%d%d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100