Submission #152708

#	Time	Username	Problem	Language	Result	Execution time	Memory
152708		toloraia	Pipes (CEOI15_pipes)	C++17	0 / 100	2155 ms	65540 KiB

pipes

#include <bits/stdc++.h>
#define F first
#define S second
#define mp make_pair
#define pb push_back
#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))
/*
#pragma comment(linker, "/STACK: 20000000005")
#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 ("O3")
#pragma GCC optimization ("unroll-loops")
*/
using namespace std;

const int N = 1e5 + 5, M = 6e6 + 5;

int n, m;

ll K;

vector < ll > g[N], gg[N];
vector < ll > G[N];
int x, y;
int T;
int in[N], up[N];

void dfs (int k, int p){
    in[k] = ++T;
    up[k] = in[k];
    int to, i, toto;
    int num = (int)G[k].size();
    ll X;
    for (i = 0; i < num; i++){
        X = G[k][i];
        while (X){
            toto = X % K;
            X /= K;
            to = toto;
            if (to > n)
                to -= n;
            if (i && g[k][i - 1] == to)
                continue;
            if (to == p)
                continue;
            if (in[to]){
                up[k] = min (up[k], in[to]);
                continue;
            }
            dfs (to, k);
            if (up[to] > in[k] && to == toto){
                cout << k << " " << to << endl;
            }
            up[k] = min (up[k], up[to]);
        }
    }
}

vector < ll > V;

main()
{
    //freopen ("in.in", "r", stdin);freopen ("out.out", "w", stdout);
    //ios_base::sync_with_stdio(false);
    cin >> n >> m;
    K = n * 2 + 1;
    for (int i = 1; i <= m; i++){
        scanf ("%d %d", &x, &y);
        if (x > y)
            swap (x, y);
        g[x].pb (y);
    }
    int t, num;
    ll X, j;
    for (int i = 1; i <= n; i++){
        num = (int)g[i].size();
        V.clear();
        for (int j = 0; j < num; j++){
            if (j && g[i][j] == g[i][j - 1])
                continue;
            if (j + 1 < num && g[i][j] == g[i][j + 1])
                V.pb (g[i][j] + n);
            else
                V.pb (g[i][j]);
        }
        for (int to : g[i]){
            gg[to].pb (i);
        }
        g[i].clear();
        num = (int)V.size();
        for (j = 0; j < num; j += 3){
            X = 0;
            for (t = j; t < j + 3 && t < num; t++){
                X = X * K + V[t];
            }
            G[i].pb (X);
        }
    }
    for (int i = 1; i <= n; i++){
        g[i] = gg[i];
        gg[i].clear();
        num = (int)g[i].size();
        V.clear();
        for (int j = 0; j < num; j++){
            if (j && g[i][j] == g[i][j - 1])
                continue;
            if (j + 1 < num && g[i][j] == g[i][j + 1])
                V.pb (g[i][j] + n);
            else
                V.pb (g[i][j]);
        }
        g[i].clear();
        num = (int)V.size();
        for (j = 0; j < num; j += 3){
            X = 0;
            for (t = j; t < j + 3 && t < num; t++){
                X = X * K + V[t];
            }
            G[i].pb (X);
        }
    }
    for (int i = 1; i <= n; i++)
        if (in[i] == 0)
            dfs (i, 0);
    return 0;
}

Compilation message (stderr)

pipes.cpp:68:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
pipes.cpp: In function 'int main()':
pipes.cpp:75:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf ("%d %d", &x, &y);
         ~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 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