Break statement affecting Code for CNOT

general
1 
#include <iostream>
#include <stdbool.h>
using namespace std;

int main() {
    int t;
    cin >> t;
    while(t--){
        int x,y,k,n;
        cin >> x >> y >> k >> n;
        int left = x-y;
        bool buy=false;
        int page, prc;
        for(int i=0;i<n;i++){
            cin >> page >> prc;
            if(page >= left && prc <= k ){
                buy = true;
                // break;
            }
        }
        if(buy==true) cout << "LuckyChef\n";
        else cout << "UnluckyChef\n";
    }
	return 0;
}

For the Problem CNOT(Chef and Notebooks), this code passes all the test but when I uncomment the break statement it gives wrong answer, but why?, please help on this.
Thank you

2

@achal_t
plzz send the link to the problem

3

this is the problem link

5

@achal_t In the for loop, you’re having a line

cin >> page >> prc;

This line takes the number of page, cost of notebook as input.
If you break this loop then the code will no longer look into the details of the rest of the notebooks.

While reading the inputs for the next testcases, you’re program will read the remaining details of the previous notebooks (because they were left out). This will result in taking wrong values as input, and hence wrong answer.

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