题目描述：输入：n + 1行第一行输入一个数n随后n行每一行有x、y两数代表答案z除x余y输出：答案z的最小值用C++解答

#include <iostream>
#include <climits>

int main() {
    int n;
    std::cin >> n;

    int min_z = INT_MAX;

    for (int i = 0; i < n; i++) {
        int x, y;
        std::cin >> x >> y;
        int z = x % y;
        if (z < min_z) {
            min_z = z;
        }
    }

    std::cout << min_z << std::endl;

    return 0;
}