cp-stuff/findingBridges.cpp at master · zunaid13/cp-stuff · GitHub

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/*
⡆⣐⢕⢕⢕⢕⢕⢕⢕⢕⠅⢗⢕⢕⢕⢕⢕⢕⢕⠕⠕⢕⢕⢕⢕⢕⢕⢕⢕⢕
⢐⢕⢕⢕⢕⢕⣕⢕⢕⠕⠁⢕⢕⢕⢕⢕⢕⢕⢕⠅⡄⢕⢕⢕⢕⢕⢕⢕⢕⢕
⢕⢕⢕⢕⢕⠅⢗⢕⠕⣠⠄⣗⢕⢕⠕⢕⢕⢕⠕⢠⣿⠐⢕⢕⢕⠑⢕⢕⠵⢕
⢕⢕⢕⢕⠁⢜⠕⢁⣴⣿⡇⢓⢕⢵⢐⢕⢕⠕⢁⣾⢿⣧⠑⢕⢕⠄⢑⢕⠅⢕
⢕⢕⠵⢁⠔⢁⣤⣤⣶⣶⣶⡐⣕⢽⠐⢕⠕⣡⣾⣶⣶⣶⣤⡁⢓⢕⠄⢑⢅⢑
⠍⣧⠄⣶⣾⣿⣿⣿⣿⣿⣿⣷⣔⢕⢄⢡⣾⣿⣿⣿⣿⣿⣿⣿⣦⡑⢕⢤⠱⢐
⢠⢕⠅⣾⣿⠋⢿⣿⣿⣿⠉⣿⣿⣷⣦⣶⣽⣿⣿⠈⣿⣿⣿⣿⠏⢹⣷⣷⡅⢐
⣔⢕⢥⢻⣿⡀⠈⠛⠛⠁⢠⣿⣿⣿⣿⣿⣿⣿⣿⡀⠈⠛⠛⠁⠄⣼⣿⣿⡇⢔
⢕⢕⢽⢸⢟⢟⢖⢖⢤⣶⡟⢻⣿⡿⠻⣿⣿⡟⢀⣿⣦⢤⢤⢔⢞⢿⢿⣿⠁⢕
⢕⢕⠅⣐⢕⢕⢕⢕⢕⣿⣿⡄⠛⢀⣦⠈⠛⢁⣼⣿⢗⢕⢕⢕⢕⢕⢕⡏⣘⢕
⢕⢕⠅⢓⣕⣕⣕⣕⣵⣿⣿⣿⣾⣿⣿⣿⣿⣿⣿⣿⣷⣕⢕⢕⢕⢕⡵⢀⢕⢕
⢑⢕⠃⡈⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⢃⢕⢕⢕
⣆⢕⠄⢱⣄⠛⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⢁⢕⢕⠕⢁
⣿⣦⡀⣿⣿⣷⣶⣬⣍⣛⣛⣛⡛⠿⠿⠿⠛⠛⢛⣛⣉⣭⣤⣂⢜⠕⢑⣡⣴⣿
*/
#include <bits/stdc++.h>

using namespace std;
#ifdef LOCAL
 #include "Dbug.h"
#else
 #define dbg(...)
#endif

// #warning CHANGE INT-LONG-LONG IN CASE OF ORDERED SET
// #warning CHANGE MAX VALUE
// #warning change endl and FastIO for interactive
typedef long long LL;
typedef long double LD;
#define pi acos(-1)
#define all(x) begin(x), end(x)
#define endl "\n"
#define TESTS int test; cin>>test; for(int kase = 1 ; kase <= test ; kase++) solve(kase);
#define CASEOUT cout << "Case " << testcase << ": "
#define int long long
#define pii pair<int,int>
#ifdef LOCAL
 const LL MAX = 100;
#else
 const LL MAX = 1e2;
#endif
const LL MOD = (1e9) + 7;
const LL INF = (1e15) + 5;

vector<int> adj[MAX]; // adjacency list of graph
int n; // number of nodes
vector<bool> visited;
vector<int> tin, low;
int timer;

void ISBRIDGE(int v, int to);

int dfs(int v, int p = -1) {
    visited[v] = true;
    tin[v] = low[v] = timer++;
    int ret = 1;
    for (int to : adj[v]) {
        if (to == p) {
            continue;
        }
        if (visited[to]) {
            low[v] = min(low[v], tin[to]);
        } else {
            int val = dfs(to, v);
            ret += val;
            low[v] = min(low[v], low[to]);
            if (low[to] > tin[v])
                ISBRIDGE(v, to);
        }
    }
    return ret;
}

void find_bridges() {
    timer = 0;
    visited.assign(n+1, false);
    tin.assign(n+1, -1);
    low.assign(n+1, -1);
    for (int i = 1; i <= n; ++i) {
        if (!visited[i])
            dfs(i);
    }
}


int solve(int testcase)
{
    return testcase;
}

signed main()
{
    #ifdef LOCAL
       freopen("in.txt", "r", stdin);
       freopen("out.txt", "w", stdout);
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //cout.tie(NULL);

    //solve(0);
    //TESTS
    return 0;
}