Submission #5032647

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Source Code Expand

#include <iostream>
using namespace std;

int main() {
	int ans = 0;
	char c;
	while (cin >> c) {
		if (ans >> c - 'a' & 1) {
			cout << "no" << endl;
			return 0;
		}
		ans |= 1 << c - 'a';
	}
	cout << "yes" << endl;
}

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