#include <iostream> using namespace std; int main() { int c1, c2; cin >> c1 >> c2; int m = (c2 - c1) / 100; if(m % 100 >= 50) { m++; } int hour = m / 3600; int minute = m % 3600 / 60; int second = m % 60; printf("%02d:%02d:%02d", hour, minute, second); return 0; }
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