Submission #491572

#	Time	Username	Problem	Language	Result	Execution time	Memory
491572		vendx_greyback	Traffic (IOI10_traffic)	C++14	Compilation error	0 ms	0 KiB

traffic

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) (x).begin(),(x).end()

typedef pair<int,int> ppi;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;

const int mxn = 1e6;
vi adj[mxn];
int sz[mxn];
int mx[mxn];

void dfs(int u, int p){
    
    for(auto v: adj[u]){
        
        if(v == p)
            continue;
            
        dfs(v, u);
        sz[u] += sz[v];
        mx[u] = max(mx[u], sz[v]);
        
    }
    
}

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]);
    }
    
    int total;
    for(int i = 0; i < n; i++){
        sz[i] = p[i];
        total += p[i];
    }
        
    dfs(0, -1);
    
    int wt = 1e18;
    int res = -1;
    
    for(int i = 0; i < n; i++){
        
        int temp = max(mx[i], total - sz[i]);
        
        if(temp < wt){
            wt = temp;
            res = i;
        }
        
    }
    
    return res;
    
}

Compilation message (stderr)

traffic.cpp: In function 'long long int LocateCentre(long long int, long long int*, long long int*, long long int*)':
traffic.cpp:40:15: warning: 'total' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |         total += p[i];
      |         ~~~~~~^~~~~~~
/usr/bin/ld: /tmp/cc3WafVm.o: in function `main':
grader.cpp:(.text.startup+0xe1): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status