Help me in solving VOLCONTROL problem

help
,
1

My issue

My code

#include <iostream>
#include<vector>
#include<cmath>
using namespace std;

int main() {
	// your code goes here
    int T;
    std::cin >> T;

    std::vector<std::pair<int, int>> testCases(T);
    for (int i = 0; i < T; ++i) {
        std::cin >> testCases[i].first >> testCases[i].second;
    }

    for (int i = 0; i < T; ++i) {
        int X = testCases[i].first;
        int Y = testCases[i].second;

        int D = std::abs(X - Y);
        int result;
        if (D % 2 == 0) {
            result = D / 2;
        } else {
            result = (D + 1) / 2;
        }

        std::cout << result << "\n";
    }
	return 0;
}

Problem Link: VOLCONTROL Problem - CodeChef