USACO-T034: Controlling Companies

/*
ID: mickyta1
TASK: concom
LANG: C++
*/

#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> pii;

const int N = 100 + 5;

vector<pii> adj[N];
int con[N];

void BFS(int st){
    for(int u = 0; u <= 100; ++u){
        con[u] = 0;
    }
    con[st] = 100;
    vector<int> ans;
    queue<int> que;
    que.push(st);
    while(!que.empty()){
        int u = que.front();
        que.pop();
        if(u != st){
            ans.push_back(u);
        }
        for(pii nxt : adj[u]){
            int v = nxt.first;
            int w = nxt.second;
            if(con[v] <= 50){
                con[v] += w;
                if(con[v] > 50){
                    que.push(v);
                }
            }
        }
    }
    sort(ans.begin(), ans.end());
    for(int x : ans){
        cout << st << ' ' << x << '\n';
    }
}

int main(){
    freopen("concom.in", "r", stdin);
    freopen("concom.out", "w", stdout);

    int Q;
    scanf("%d", &Q);
    while(Q--){
        int u, v, w;
        scanf("%d%d%d", &u, &v, &w);
        adj[u].emplace_back(v, w);
    }
    for(int u = 1; u <= 100; ++u){
        BFS(u);
    }

    fclose(stdin);
    fclose(stdout);
    return 0;
}