This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define se second
#define fi first
using namespace std;
vector < vector < pair < int,int > > > g;
int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n,m;
    cin >> n >> m;
    vector < int > c;
    g.resize(n+m+1);
    for (int i=2; i<=n+m; i++) {
        int p;
        int cc;
        cin >> p >> cc;
        c.push_back(cc);
        g[i].push_back({p,cc});
        g[p].push_back({i,cc});
    }
    sort (c.begin(),c.end());
    if (n==1) {
        cout << c[(c.size()-1)/2];
        return 0;
    }
    return 0;
}
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