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#include <iostream> using namespace std; int main() { int h1, m1; int h2, m2; cin >> h1 >> m1; cin >> h2 >> m2; int min1 = h1 * 60 + m1; int min2 = h2 * 60 + m2; if((m2 < m1 and h2 == h1) or h1 > h2) { min2 += 24 * 60; } int h3 = (min2 - min1) / 60; int m3 = (min2 - min1) % 60; if(h3 < 10) { cout << "0"; } cout << h3 << ":"; if(m3 < 10) { cout << "0"; } cout << m3 << endl; return 0; } // 19 --> 20
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