I submitted this code recently to INTEREQ Problem - CodeChef
#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <cmath>
#include <set>
#include <queue>
#define ll long long
using namespace std;
using namespace std;
void print(vector<int> v){
for(int i: v) cout << i << " ";
cout << endl;
}
vector<int> set_to_vector(set<int> s){
vector<int> v;
for(int i: s) v.push_back(i);
return v;
}
vector<int> cur;
int cntr = 0;
int n;
int query(vector<int> q){
cntr++;
cout << "? ";
cout << q.size() << " ";
for(int i: q){
cout << i + 1 << " ";
}
int x;
cin >> x;
return x;
}
int binSearch(int l, int r, int ind){
if(l == r){
return l;
}
int m = (l + r)/2;
set<int> cur1;
for(int i = l; i <= m; i++){
cur1.insert(cur[i]);
}
cur1.insert(ind);
if(query(set_to_vector(cur1)) == 2){
cntr++;
return binSearch(l, m, ind);
}else{
return binSearch(m + 1, r, ind);
}
}
int main() {
int t;
cin >> t;
while(t--) {
cur.clear();
cin >> n;
int q;
cin >> q;
vector<int> res;
for (int i = 0; i < n; i++) {
vector<int> dum = cur;
dum.push_back(i);
if (query(dum) == 1) {
cur.push_back(i);
res.push_back(cur.size());
} else {
res.push_back(binSearch(0, cur.size() - 1, i) + 1);
}
}
cout << "! ";
print(res);
}
}
HOWEVER, for some very strange reason, it tells me that my code takes -1ms to run & it gives a wrong answer… why?
See more here: CodeChef: Practical coding for everyone