Submission #428079

#	Time	Username	Problem	Language	Result	Execution time	Memory
428079		aris12345678	Traffic (IOI10_traffic)	C++14	0 / 100	14 ms	23756 KiB

traffic

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

const int mxN = 1000005;
vector<int> adj[mxN];
int sums[mxN], res[mxN];

void dfs(int u, int par, int p[]) {
    sums[u] = p[u], res[u] = INT_MIN;
    for(auto &v : adj[u]) {
        if(v == par) continue;
        dfs(v, u, p);
        sums[u] += sums[v];
        res[u] = max(res[u], sums[v]);
    }
    res[u] = max(res[u], sums[0]-sums[u]);
}

int LocateCentre(int n, int p[], int s[], int d[]) {
    for(int i = 0; i < n-1; i++) {
        adj[s[i]].push_back(d[i]);
        adj[d[i]].push_back(s[i]);
    }
    dfs(0, -1, p);
    int ans = INT_MAX, pos;
    for(int i = 0; i < n; i++) {
        if(ans > res[i])
            ans = res[i], pos = i;
    }
    return pos;
}

Compilation message (stderr)

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:31:12: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |     return pos;
      |            ^~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25