26 lines
473 B
Java
26 lines
473 B
Java
package chelper;
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import java.util.HashSet;
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import java.util.Set;
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import io.InputReader;
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import io.OutputWriter;
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public class B {
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public void solve(int testNumber, InputReader in, OutputWriter out) {
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int n = in.nextInt();
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String s = in.nextString();
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Set<Integer> set = new HashSet<>();
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for (char c : s.toCharArray()) {
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set.add((int)c);
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}
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if (set.size() != n) {
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out.println("NO");
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} else {
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out.println("YES");
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}
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}
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}
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