Submission #152665

#	Time	Username	Problem	Language	Result	Execution time	Memory
152665		toloraia	Potemkin cycle (CEOI15_indcyc)	C++17	70 / 100	1083 ms	6136 KiB

indcyc

#include <bits/stdc++.h>
#define F first
#define S second
#define mp make_pair
#define pb push_back
//#define ll __int128
#define ll long long
#define LEFT(a) ((a)<<1)
#define RIGHT(a) (LEFT(a) + 1)
#define MID(a,b) ((a+b)>>1)
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)<(b)?(a):(b))
#define y1 y122

/*
#pragma GCC optimize ("O3")
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2,fma")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC target ("avx2")
#pragma GCC optimization ("unroll-loops")
#pragma comment(linker, "/STACK: 20000000005")
*/

using namespace std;

const int N = 1005, M = 100005;

int n, m;

int u[M], v[M];

int G[N][N];

vector < int > g[N];

int par[N], fix[N];

queue < int > Q;

main()
{
    //freopen ("in.in", "r", stdin);freopen ("out.out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin >> n >> m;
    for (int i = 1; i <= m; i++){
        cin >> u[i] >> v[i];
        G[u[i]][v[i]] = 1;
        G[v[i]][u[i]] = 1;
        g[u[i]].pb (v[i]);
        g[v[i]].pb (u[i]);
    }
    for (int I = 1; I <= m; I++){
        for (int i = 1; i <= n; i++){
            fix[i] = 0;
            par[i] = 0;
        }
        for (int k = 1; k <= n; k++)
            if (G[k][u[I]] + G[k][v[I]] == 2)
                fix[k] = 1;
        Q.push (u[I]);
        par[u[I]] = u[I];
        while (Q.size() > 0){
            int k = Q.front();
            Q.pop();
            for (int to : g[k]){
                if (k == u[I] && to == v[I])
                    continue;
                if (par[to] || fix[to])
                    continue;
                par[to] = k;
                Q.push (to);
            }
        }
        if (par[v[I]] == 0)
            continue;
        cout << u[I] << " ";
        int x = v[I];
        while (x != u[I]){
            cout << x << " ";
            x = par[x];
        }
        return 0;
    }
    cout << "no" << endl;
    return 0;
}

Compilation message (stderr)

indcyc.cpp:41:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^

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