UVa 11309 - Counting Chaos

// UVa 11309 - Counting Chaos

#include <iostream>
#include <string>
using namespace std;

bool pal(int h, int m) {
	if (h == 0)
		return m < 10 || m % 10 == m / 10;
	else if (h < 10) {
		return h == m % 10;
	} else
		return (h / 10 == m % 10) && (h % 10 == m / 10);
}

int main() {
	int n;
	string line;
	cin >> n;
	getline(cin, line);
	for (; n; n--) {
		getline(cin, line);
		int h = (line[0] - '0') * 10 + line[1] - '0';
		int m = (line[3] - '0') * 10 + line[4] - '0';
		do {
			m++;
			if (m == 60) {
				m = 0;
				h++;
			}
			if (h == 24)
				h = 0;
		} while (!pal(h, m));
		cout << h / 10 << h % 10 << ":" << m / 10 << m % 10 << endl;

	}
	return 0;
}