what is wrong in this apporach?
problem link :- https://www.codechef.com/ZCOPRAC/problems/ZCO23002?tab=statement
//explain me why we use convex hull? like can't we do it normally? like this?
#include <bits/stdc++.h>
using namespace std;
int main() {
int n, p;
cin >> n >> p;
vector<int> a(n), b(n);
for (int i = 0; i < n; i++) {
cin >> a[i];
cin>> b[i];
}
vector<int> ans(n);
for (int i = 0; i < n; i++) {
for (int r = 0; r <= 100; r++) {
ans[i] = max((r * a[i] + (100-r) * b[i]) / 100, ans[i]);
ans[i]++;
}}
cout << ans.size() << endl;
sort(ans.begin(), ans.end());
ans.erase(unique(ans.begin(), ans.end()), ans.end());
for (int i = 0; i < ans.size(); i++) {
cout << i << endl;
}
return 0;
}