C++(씨쁠쁠)(cplusplus)-백준(baekjoon)(BaekJoon)코딩 2455번:지능형 기차 답

#include <iostream>
using namespace std;
int main() {
    int a , b , total = 0, sum, big = 0;
    
    for (int i = 0; i < 4; i++)
    {
        cin >> a>> b;
        sum = -a + b;
        total += sum;
        if (big < total)
            big = total;
    }
    cout << big << '\n';
}