#include <bits/stdc++.h>
#include <cstdlib>
#include <stdlib.h>
using namespace std;
/*
#define cin fin
#define cout fout
string __fname = ""; ifstream fin(__fname + ".in"); ofstream fout(__fname + ".out");
*/
#define ull unsigned long long
#define ll long long
#define int long long
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
int mod = 1e9 + 7;
const int inf = 1e18;
const int N = 1e6 + 10;
void solve(){
int n, k, q, t;
cin >> n >> k >> q >> t;
vector<int> ans(n + 5, 0ll);
int root = -1;
for(int i = 1; i <= n; i++){
int x;
cin >> x;
if(x == -1)
root = i;
}
for(int i = 1; i <= n; i++){
int x;
cin >> x;
}
int aux_k = k;
vector<int> aux; // size q
aux.push_back(root);
cout << root << ' ';
k--;
for(int i = 1; i <= n && k; i++){
if(i != root)
cout << i << ' ', k--, aux.push_back(i);
}
cout << endl;
for(int i = 1; i <= q; i++)
cout << "? " << root << ' ' << aux[i] << endl;
cout << "!" << endl;
k = aux_k;
for(int i = 1; i <= q; i++){
int x;
cin >> x >> x >> x >> x;
ans[aux[i]] = x;
}
vector<int> res(t + 5, 0ll);
for(int i = 1; i <= t; i++){
int x, y;
cin >> x >> y;
res[i] = ans[x] + ans[y];
}
for(int i = 1; i <= t; i++)
cout << res[i] << ' ' << res[i] << endl;
cout << endl;
}
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