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  1. import java.io.Closeable;
  2. import java.io.File;
  3. import java.io.FileInputStream;
  4. import java.io.FileNotFoundException;
  5. import java.io.IOException;
  6. import java.io.InputStream;
  7. import java.io.PrintWriter;
  8. import java.util.NoSuchElementException;
  9. import java.util.Scanner;
  10.  
  11. public class Main {
  12. 	public static void main(String[] args) {
  13. 		test("10000000.txt",10000000,1,1,1000000000);
  14. 	}
  15. 	public static void test(String filename,int h,int w,int min,int max) {
  16. 		try {
  17. 			generate(filename, h, w, min, max);
  18. 			bm1(filename);
  19. 			bm2(filename);
  20. 			bm3(filename);
  21. 		} catch (IOException e) {
  22. 			e.printStackTrace();
  23. 		}
  24. 	}
  25. 	public static void generate(String filename,int h,int w,int min,int max) {
  26. 		try(PrintWriter pw = new PrintWriter(filename)) {
  27. 			pw.println(h + " " + w);
  28. 			for(int i=0;i<h;i++) {
  29. 				for(int j=0;j<w;j++) {
  30. 					if (j > 0) {
  31. 						pw.print(' ');
  32. 					}
  33. 					pw.print(randomInt(min, max));
  34. 				}
  35. 				pw.println();
  36. 			}
  37. 		} catch (FileNotFoundException e) {
  38. 			e.printStackTrace();
  39. 		}
  40. 	}
  41. 	public static int randomInt(int min,int max) {
  42. 		return (int) (Math.random() * (max - min + 1)) + min;
  43. 	}
  44. 	public static void bm1(String filename) throws FileNotFoundException {
  45. 		long stime = System.nanoTime();
  46. 		Scanner sc = new Scanner(new File(filename));
  47. 		int h = sc.nextInt();
  48. 		int w = sc.nextInt();
  49. 		long sum = 0;
  50. 		for(int i=0;i<h;i++) {
  51. 			for(int j=0;j<w;j++) {
  52. 				sum += sc.nextInt();
  53. 			}
  54. 		}
  55. 		System.out.println(sum);
  56. 		System.out.println((System.nanoTime() - stime) / 1000000 + " ms");
  57. 		sc.close();
  58. 	}
  59. 	public static void bm2(String filename) throws FileNotFoundException {
  60. 		long stime = System.nanoTime();
  61. 		Scanner sc = new Scanner(new File(filename));
  62. 		int h = Integer.parseInt(sc.next());
  63. 		int w = Integer.parseInt(sc.next());
  64. 		long sum = 0;
  65. 		for(int i=0;i<h;i++) {
  66. 			for(int j=0;j<w;j++) {
  67. 				sum += Integer.parseInt(sc.next());
  68. 			}
  69. 		}
  70. 		System.out.println(sum);
  71. 		System.out.println((System.nanoTime() - stime) / 1000000 + " ms");
  72. 		sc.close();
  73. 	}
  74. 	public static void bm3(String filename) throws FileNotFoundException {
  75. 		long stime = System.nanoTime();
  76. 		FastScanner sc = new FastScanner(new FileInputStream(filename));
  77. 		int h = sc.nextInt();
  78. 		int w = sc.nextInt();
  79. 		long sum = 0;
  80. 		for(int i=0;i<h;i++) {
  81. 			for(int j=0;j<w;j++) {
  82. 				sum += sc.nextInt();
  83. 			}
  84. 		}
  85. 		System.out.println(sum);
  86. 		System.out.println((System.nanoTime() - stime) / 1000000 + " ms");
  87. 		sc.close();
  88. 	}
  89. }
  90. class FastScanner implements Closeable {
  91. 	private final InputStream in;
  92. 	private final byte[] buffer = new byte[1024];
  93. 	private int ptr = 0;
  94. 	private int buflen = 0;
  95. 	public FastScanner(InputStream in) {
  96. 		this.in = in;
  97. 	}
  98. 	private boolean hasNextByte() {
  99. 		if (ptr < buflen) {
  100. 			return true;
  101. 		}else{
  102. 			ptr = 0;
  103. 			try {
  104. 				buflen = in.read(buffer);
  105. 			} catch (IOException e) {
  106. 				e.printStackTrace();
  107. 			}
  108. 			if (buflen <= 0) {
  109. 				return false;
  110. 			}
  111. 		}
  112. 		return true;
  113. 	}
  114. 	private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
  115. 	private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
  116. 	public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
  117. 	public String next() {
  118. 		if (!hasNext()) throw new NoSuchElementException();
  119. 		StringBuilder sb = new StringBuilder();
  120. 		int b = readByte();
  121. 		while(isPrintableChar(b)) {
  122. 			sb.appendCodePoint(b);
  123. 			b = readByte();
  124. 		}
  125. 		return sb.toString();
  126. 	}
  127. 	public long nextLong() {
  128. 		if (!hasNext()) throw new NoSuchElementException();
  129. 		long n = 0;
  130. 		boolean minus = false;
  131. 		int b = readByte();
  132. 		if (b == '-') {
  133. 			minus = true;
  134. 			b = readByte();
  135. 		}
  136. 		if (b < '0' || '9' < b) {
  137. 			throw new NumberFormatException();
  138. 		}
  139. 		while(true){
  140. 			if ('0' <= b && b <= '9') {
  141. 				n *= 10;
  142. 				n += b - '0';
  143. 			}else if(b == -1 || !isPrintableChar(b)){
  144. 				return minus ? -n : n;
  145. 			}else{
  146. 				throw new NumberFormatException();
  147. 			}
  148. 			b = readByte();
  149. 		}
  150. 	}
  151. 	public int nextInt() {
  152. 		long nl = nextLong();
  153. 		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
  154. 		return (int) nl;
  155. 	}
  156. 	public double nextDouble() { return Double.parseDouble(next());}
  157. 	public void close() {
  158. 		try {
  159. 			in.close();
  160. 		} catch (IOException e) {
  161. 		}
  162. 	}
  163. }
Success #stdin #stdout #stderr 0.12s 320576KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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java.io.FileNotFoundException: 10000000.txt (Permission denied)
	at java.io.FileOutputStream.open0(Native Method)
	at java.io.FileOutputStream.open(FileOutputStream.java:270)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:101)
	at java.io.PrintWriter.<init>(PrintWriter.java:184)
	at Main.generate(Main.java:26)
	at Main.test(Main.java:17)
	at Main.main(Main.java:13)
java.io.FileNotFoundException: 10000000.txt (No such file or directory)
	at java.io.FileInputStream.open0(Native Method)
	at java.io.FileInputStream.open(FileInputStream.java:195)
	at java.io.FileInputStream.<init>(FileInputStream.java:138)
	at java.util.Scanner.<init>(Scanner.java:611)
	at Main.bm1(Main.java:46)
	at Main.test(Main.java:18)
	at Main.main(Main.java:13)
https://ideone.com/DBFV5a
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
secret

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