Submission #503248

#	Time	Username	Problem	Language	Result	Execution time	Memory
503248		Hi_Im_Not_Meo_Meo	Traffic (IOI10_traffic)	C++14	Compilation error	0 ms	0 KiB

traffic

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1000010;

int n;
int val[MAXN];
vector<int> adj[MAXN];

int vv = INT_MAX, ans;

int sz[MAXN];
void comp(int u, int par = -1) {
    sz[u] = val[u];
    for (auto &v : adj[u]) if (v != par) {
        comp(v, u);
        sz[u] += sz[v];
    }
}
void dfs(int u, int x = 0, int par = -1) {
    int mx = x;
    for (auto &v : adj[u]) if (v != par) {
        dfs(v, x + sz[u] - sz[v], u);
        mx = max(mx, sz[v]);
    }
    if (mx < vv) {
        vv = mx;
        ans = u;
    }
}

int main() {
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d", val + i);
    }
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        scanf("%d%d", &u, &v);
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    comp(0);
    dfs(0);
    printf("%d\n", ans);
}

Compilation message (stderr)

traffic.cpp: In function 'int main()':
traffic.cpp:34:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
traffic.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         scanf("%d", val + i);
      |         ~~~~~^~~~~~~~~~~~~~~
traffic.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         scanf("%d%d", &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccqf6lQ1.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cclJWyu1.o:traffic.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccqf6lQ1.o: in function `main':
grader.cpp:(.text.startup+0xe1): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status