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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. const int H = 10000;
  5. const int W = 10000;
  6.  
  7. int main(int argc, char* argv[]) {
  8.   int** table = (int**)malloc(H * sizeof(int*));
  9.   for (int i = 0; i < H; ++i) {
  10.     table[i] = (int*)malloc(W * sizeof(int));
  11.   }
  12.   for (int row = 0; row < H; ++row) {
  13.     for (int col = 0; col < W; ++col) {
  14.       table[row][col] = (col + 1) + W * row;
  15.     }
  16.   }
  17.  
  18.   long total = 0;
  19.  
  20.   if (argc == 1) {
  21.     printf("access: for each row\n");
  22.     for (int i = 0; i < 10; ++i) {
  23.       for (int row = 0; row < 10000; ++row) {
  24.         for (int col = 0; col < 10000; ++col) {
  25.           total += table[row][col];
  26.         }
  27.       }
  28.     }
  29.   } else {
  30.     printf("access: for each column\n");
  31.     for (int i = 0; i < 10; ++i) {
  32.       for (int col = 0; col < 10000; ++col) {
  33.         for (int row = 0; row < 10000; ++row) {
  34.           total += table[row][col];
  35.         }
  36.       }
  37.     }
  38.   }
  39.  
  40.   return 0;
  41. }
Success #stdin #stdout 0.2s 392316KB
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Standard input is empty
stdout
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access: for each row
https://ideone.com/VjhO3l
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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