제출 #38491

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
38491		alenam0161	Marriage questions (IZhO14_marriage)	C++14	50 / 100	1500 ms	2700 KiB

marriage

#include <bits/stdc++.h>

using namespace std;

const int N = 5e2+7;
vector<int> g[N],g1[N];
int n,m,k;
bool used[N];
int ma[N];
bool try_khun(int v){
    if(used[v]==true)return false;
    used[v]=true;
    for(auto to:g[v]){
        if(ma[to]==-1||try_khun(ma[to])){
            ma[to]=v;
            return true;
        }
    }
    return false;
}
int main(){
    memset(ma,-1,sizeof(ma));
    scanf("%d%d%d",&n,&m,&k);
    for(int i=1;i<=k;++i){
        int u,v;
        scanf("%d%d",&v,&u);
        g[v].push_back(u);
        g1[u].push_back(v);
    }
    int how=0;
    long long ans=0;
    for(int l=1;l<=n;++l)
    for(int r=l;r<=n;++r){
            how=0;
            memset(ma,-1,sizeof(ma));
            for(int j=l;j<=r;++j){
                memset(used,0,sizeof(used));
                how+=try_khun(j);
            }
            if(how==m)ans++;
    }
    cout<<ans<<endl;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

marriage.cpp: In function 'int main()':
marriage.cpp:23:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&n,&m,&k);
                             ^
marriage.cpp:26:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&v,&u);
                            ^

• Subtask 1: 50 / 100