Submission #42608

#	Time	Username	Problem	Language	Result	Execution time	Memory
42608		nonocut	Potemkin cycle (CEOI15_indcyc)	C++14	30 / 100	404 ms	5332 KiB

indcyc

#include<bits/stdc++.h>
using namespace std;
const int maxn = 1e3 + 5;
int n,m;
int c[maxn][maxn];
vector<int> a, b;
int main() {
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++) c[i][i] = 1;
    for(int i=1;i<=m;i++) {
        int x, y;
        scanf("%d%d",&x,&y);
        c[x][y] = c[y][x] = 1;
    }
    for(int x=1;x<=n;x++) {
        for(int y=x+1;y<=n;y++) {
            if(!c[x][y]) continue;
            a.clear(); b.clear();
            for(int i=1;i<=n;i++) {
                if(c[i][x] && !c[i][y]) a.push_back(i);
                if(c[i][y] && !c[i][x]) b.push_back(i);
            }
            for(auto t1 : a) {
                for(auto t2 : b) {
                    if(c[t1][t2]) {
                        printf("%d %d %d %d",t1,x,y,t2);
                        return 0;
                    }
                }
            }
        }
    }
    printf("no");
}

Compilation message (stderr)

indcyc.cpp: In function 'int main()':
indcyc.cpp:8:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^
indcyc.cpp:12:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&x,&y);
                            ^

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10