Submission #383939

#	Time	Username	Problem	Language	Result	Execution time	Memory
383939		aaravdodhia	Traffic (IOI10_traffic)	C++17	Compilation error	0 ms	0 KiB

traffic

#include <bits/stdc++.h>

using namespace std;

int N;
vector<int> P;
vector<vector<int>> adj;

int DFS(int u, int p, int root){
    int max_traffic = 0, cur_traffic = P[u];

    for(int v : adj[u]){
        if(v == p) continue;
        max_traffic = max(max_traffic, DFS(v, u, root));
        cur_traffic += DFS(v, u, root);
    }

    if(u != root){
        max_traffic = max(max_traffic, cur_traffic);
    }
    return max_traffic;
}

int LocateCenter(){
    int arena = N, min_congestion = 2e9+1;

    for(int root = 0; root < N; root++){
        if(DFS(root, -1, root) < min_congestion){
            arena = root;
            min_congestion = DFS(root, -1, root);
        }
    }

//    cout << min_congestion << endl;
    return arena;
}

int main()
{
    cin >> N;
    adj.resize(N);

    P.resize(N);
    for(int i=0; i<N; i++)
        cin >> P[i];

    vector<int> S(N), D(N);
    for(int i=0; i<N-1; i++)
        cin >> S[i];
    for(int i=0; i<N-1; i++)
        cin >> D[i];

    int a, b;
    for(int i=0; i<N-1; i++){
        adj[S[i]].push_back(D[i]);
        adj[D[i]].push_back(S[i]);
    }

    cout << LocateCenter() << endl;
}

Compilation message (stderr)

traffic.cpp: In function 'int main()':
traffic.cpp:53:9: warning: unused variable 'a' [-Wunused-variable]
   53 |     int a, b;
      |         ^
traffic.cpp:53:12: warning: unused variable 'b' [-Wunused-variable]
   53 |     int a, b;
      |            ^
/tmp/ccE6CWjm.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccUvnria.o:traffic.cpp:(.text.startup+0x0): first defined here
/tmp/ccE6CWjm.o: In function `main':
grader.cpp:(.text.startup+0xd9): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status