제출 #680456

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
680456		danikoynov	Pipes (CEOI15_pipes)	C++14	0 / 100	1239 ms	56760 KiB

pipes

/**
 ____ ____ ____ ____ ____ ____
||l |||e |||i |||n |||a |||d ||
||__|||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|/__\|

**/

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const int maxn = 1e5 + 10;
struct edge
{
    int v, u;
    edge(int _v, int _u)
    {
        v = _v;
        u = _u;
    }
};

int n, m;
int par1[maxn], par2[maxn];
int find_leader1(int v)
{
    if (v == par1[v])
        return v;
    return (par1[v] = find_leader1(par1[v]));
}

bool connected1(int v, int u)
{
    v = find_leader1(v);
    u = find_leader1(u);

    if (v == u)
        return true;
    par1[u] = v;
    return false;
}


int find_leader2(int v)
{
    if (v == par2[v])
        return v;
    return (par2[v] = find_leader2(par2[v]));
}
bool connected2(int v, int u)
{
    v = find_leader2(v);
    u = find_leader2(u);
    if (v == u)
        return true;

    par2[u] = v;
    return false;
}

vector < int > g[maxn];
int tin[maxn], low[maxn], timer;
void dfs(int v, int p)
{
    tin[v] = low[v] = ++ timer;
    ///cout << v << " : " << p << " " << g[v].size() << endl;
    for (int u : g[v])
    {
        if (u == p)
            continue;

        if (tin[u] != 0)
        {
            low[v] = min(low[v], tin[u]);
        }
        else
        {
            dfs(u, v);
            if (low[u] > tin[v])
                cout << v << " " << u << endl;
                low[v] = min(low[v], low[u]);
        }
    }
}
void solve()
{
    cin >> n >> m;
    int v, u;
    for (int i = 1; i <= n; i ++)
        par1[i] = i, par2[i] = i;
        vector < edge > ed;
    for (int i = 1; i <= m; i ++)
    {
        cin >> v >> u;
        if (connected1(v, u))
        {
            if (!connected2(v, u))
                ed.push_back(edge(v, u));
        }
        else
        {
            ed.push_back(edge(v, u));
        }
    }


    for (edge cur : ed)
    {
        g[cur.v].push_back(cur.u);
        g[cur.u].push_back(cur.v);
        //cout << cur.v << " " << cur.u << " : " << endl;
       // cout << g[7].size() << endl;
    }

    for (int i = 1; i <= n; i ++)
        if (tin[i] == 0)
    dfs(i, 0);
}

int main()
{
    speed();
    solve();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:89:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   89 |             if (low[u] > tin[v])
      |             ^~
pipes.cpp:91:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   91 |                 low[v] = min(low[v], low[u]);
      |                 ^~~
pipes.cpp: In function 'void solve()':
pipes.cpp:99:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   99 |     for (int i = 1; i <= n; i ++)
      |     ^~~
pipes.cpp:101:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  101 |         vector < edge > ed;
      |         ^~~~~~

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