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  1. import java.io.IOException;
  2. import java.io.OutputStreamWriter;
  3. import java.util.Arrays;
  4. import java.io.BufferedWriter;
  5. import java.util.InputMismatchException;
  6. import java.io.OutputStream;
  7. import java.io.PrintWriter;
  8. import java.util.NoSuchElementException;
  9. import java.io.Writer;
  10. import java.math.BigInteger;
  11. import java.io.InputStream;
  12.  
  13. /**
  14.  * Built using CHelper plug-in
  15.  * Actual solution is at the top
  16.  */
  17. public class Main {
  18. 	public static void main(String[] args) {
  19. 		InputStream inputStream = System.in;
  20. 		OutputStream outputStream = System.out;
  21. 		InputReader in = new InputReader(inputStream);
  22. 		OutputWriter out = new OutputWriter(outputStream);
  23. 		PHONELST solver = new PHONELST();
  24. 		int testCount = Integer.parseInt(in.next());
  25. 		for (int i = 1; i <= testCount; i++)
  26. 			solver.solve(i, in, out);
  27. 		out.close();
  28. 	}
  29. }
  30.  
  31.  class PHONELST {
  32.     public void solve(int testNumber, InputReader in, OutputWriter out) {
  33.         int n = in.readInt();
  34.         String[] s = new String[n];
  35.         for (int i = 0; i < n; i++) {
  36.             s[i] = in.readString();
  37.         }
  38.         Arrays.sort(s);
  39.         for (int i = 0; i < n - 1; i++) {
  40.             if (s[i + 1].startsWith(s[i])) {
  41.                 out.printLine("NO");
  42.                 return;
  43.             }
  44.         }
  45.         out.printLine("YES");
  46.     }
  47. }
  48.  
  49.  
  50.  class InputReader {
  51.  
  52.      private InputStream stream;
  53. 	private byte[] buf = new byte[1024];
  54. 	private int curChar;
  55. 	private int numChars;
  56. 	private SpaceCharFilter filter;
  57.  
  58. 	public InputReader(InputStream stream) {
  59. 		this.stream = stream;
  60. 	}
  61.  
  62. 	public int read() {
  63. 		if (numChars == -1)
  64. 			throw new InputMismatchException();
  65. 		if (curChar >= numChars) {
  66. 			curChar = 0;
  67. 			try {
  68. 				numChars = stream.read(buf);
  69. 			} catch (IOException e) {
  70. 				throw new InputMismatchException();
  71. 			}
  72. 			if (numChars <= 0)
  73. 				return -1;
  74. 		}
  75. 		return buf[curChar++];
  76. 	}
  77.  
  78.      public int readInt() {
  79. 		int c = read();
  80. 		while (isSpaceChar(c))
  81. 			c = read();
  82. 		int sgn = 1;
  83. 		if (c == '-') {
  84. 			sgn = -1;
  85. 			c = read();
  86. 		}
  87. 		int res = 0;
  88. 		do {
  89. 			if (c < '0' || c > '9')
  90. 				throw new InputMismatchException();
  91. 			res *= 10;
  92. 			res += c - '0';
  93. 			c = read();
  94. 		} while (!isSpaceChar(c));
  95. 		return res * sgn;
  96. 	}
  97.  
  98.      public String readString() {
  99. 		int c = read();
  100. 		while (isSpaceChar(c))
  101. 			c = read();
  102. 		StringBuilder res = new StringBuilder();
  103. 		do {
  104. 			if (Character.isValidCodePoint(c))
  105. 				res.appendCodePoint(c);
  106. 			c = read();
  107. 		} while (!isSpaceChar(c));
  108. 		return res.toString();
  109. 	}
  110.  
  111. 	public boolean isSpaceChar(int c) {
  112. 		if (filter != null)
  113. 			return filter.isSpaceChar(c);
  114. 		return isWhitespace(c);
  115. 	}
  116.  
  117. 	public static boolean isWhitespace(int c) {
  118. 		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
  119. 	}
  120.  
  121.      public String next() {
  122. 		return readString();
  123. 	}
  124.  
  125.      public interface SpaceCharFilter {
  126. 		public boolean isSpaceChar(int ch);
  127. 	}
  128. }
  129.  
  130.  
  131.  class OutputWriter {
  132. 	private final PrintWriter writer;
  133.  
  134. 	public OutputWriter(OutputStream outputStream) {
  135. 		writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
  136. 	}
  137.  
  138. 	public OutputWriter(Writer writer) {
  139. 		this.writer = new PrintWriter(writer);
  140. 	}
  141.  
  142.      public void print(Object...objects) {
  143. 		for (int i = 0; i < objects.length; i++) {
  144. 			if (i != 0)
  145. 				writer.print(' ');
  146. 			writer.print(objects[i]);
  147. 		}
  148. 	}
  149.  
  150.      public void printLine(Object...objects) {
  151. 		print(objects);
  152. 		writer.println();
  153. 	}
  154.  
  155.      public void close() {
  156. 		writer.close();
  157. 	}
  158.  
  159.  }
  160.  
  161.  
  162.  
Success #stdin #stdout 0.07s 380160KB
comments (?)
stdin
copy 
2
3
911
97625999
91125426
5
113
12340
123440
12345
98346
stdout
copy 
NO
YES
https://ideone.com/ag4icA
language:
Java (12.0.1)
created:
10 years ago
visibility:
secret

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