concom

/*
ID: zachery1
PROG: concom
LANG: C++
*/
#include 
#include 
#include 
#include 
#include 
#include 
#define MAXN 110
#define cin fin
#define cout fout
using namespace std;
ifstream fin("concom.in");
ofstream fout("concom.out");

typedef pair<int, int> P;
int a[MAXN][MAXN];
int control[MAXN][MAXN];
int fa[MAXN];
int n;
queue
 que;

void solve() {
    while (!que.empty()) {
        P p = que.front();
        int A = p.first;
        int B = p.second;
        que.pop();
        for (int i = 1; i <= 100; i++) {
            if (a[B][i] && B != i && A != i) {
                //cout << "a[" << B << "]" << "[" << i << "] = " << a[B][i] << endl;
                //cout << "control[" << A << "]" << "[" << i << "] = " << control[A][i] << endl;
                int old = control[A][i];
                control[A][i] += control[B][i];
                //cout << "new a[" << A << "]" << "[" << i << "] = " << control[A][i] << endl;
                if (old <= 50 && control[A][i] > 50) {
                    que.push(P(A, i));
                    fa[i] = A;
                }
            }
        }
    }
}

int main() {
    cin >> n;
    memset(a, 0, sizeof(a));
    for (int t = 0; t < n; t++) {
        int i, j, p;
        cin >> i >> j >> p;
        a[i][j] = p;
        control[i][j] = p;
        if (p > 50) {
            que.push(P(i, j));
            fa[j] = i;
        } 
    }

    solve();

    for (int i = 1; i <= 100; i++) {
        for (int j = 1; j <= 100; j++) {
            if (i != j) {
                if (control[i][j] > 50) {
                    cout << i << " " << j << endl;
                }
            }
        }
    }
    return 0;
}