Submission #1591692

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Source Code Expand

#include <iostream>
#include <bits/stdc++.h>

#define si(x) scanf("%d",&x)

using namespace std;

int main()
{
    int n;
    si(n);
    vector<int> parent(n+1),score(n+1,0),last(n+1 , 0);
    for(int i=2;i<=n;i++){
        si(parent[i]);
        score[parent[i]]++;
    }
    queue<pair<int,int> >  qu;
    for(int i=2;i<score.size();i++){
        if(score[i] == 0)qu.push({i,parent[i]});
    }
    while(!qu.empty()){
        //loser,winner
        pair<int,int> match = qu.front();qu.pop();
        last[match.second] = max(last[match.second],last[match.first]) + 1;
        score[match.second]--;
        if(score[match.second] == 0){
            if(match.second == 1)break;
            qu.push({match.second , parent[match.second]});
        }
    }
    cout << last[1];
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:11:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     si(n);
          ^
./Main.cpp:14:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         si(parent[i]);
                      ^

Judge Result