#include <bits/stdc++.h>
using namespace std;
int ferries(int n , int m , vector<int> a , vector<int> b , vector<int> c) {
vector<vector<pair<int , int>>> adj(n);
for (int i = 0 ; i < m ; i++) {
a[i] -= 1 , b[i] -= 1;
adj[a[i]].emplace_back(b[i] , c[i]);
adj[b[i]].emplace_back(a[i] , c[i]);
}
sort(c.rbegin() , c.rend());
if (m == n - 1) {
int ans = -1;
function<void(int , int , int)> Dfs = [&](int cur , int pre , int depth) {
if (cur == n - 1) {
ans = depth;
}
for (auto x : adj[cur]) {
if (x.first == pre) continue;
Dfs(x.first , cur , depth + 1);
}
return ;
};
Dfs(0 , -1 , 0);
int res = 0;
for (int i = 0 ; i < ans ; i += 1) {
res += c[i];
}
return res;
}
else {
int res = 0;
for (int i = 0 ; i < 2 ; i += 1) {
res += c[i];
}
return res;
}
}
Compilation message
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
collect2: error: ld returned 1 exit status
