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Mar 30th, 2020
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  1. #include <stdio.h>
  2.  
  3. #define N1 800
  4. #define N2 800
  5. #define N3 800
  6.  
  7. double A[N1][N2];
  8. double B[N2][N3];
  9. double C[N1][N3];
  10.  
  11. int main ()
  12. {
  13. int i, j, k;
  14. double sum;
  15.  
  16. for (i = 0; i<N1; i++) {
  17. for (j = 0; j<N2; j++) {
  18. A[i][j] = (double) i;
  19. }
  20. }
  21.  
  22. for (j = 0; j<N2; j++) {
  23. for (k = 0; k<N3; k++) {
  24. B[j][k] = (double) j;
  25. }
  26. }
  27.  
  28. for (i = 0; i<N1; i++) {
  29. for (k = 0; k<N3; k++) {
  30. sum = 0.0;
  31. for (j = 0; j<N2; j++) {
  32. sum += A[i][j] * B[j][k];
  33. }
  34. C[i][k] = sum;
  35. }
  36. }
  37.  
  38. printf("Result: %f\n", C[N1/2][N3/2]);
  39.  
  40. return 0;
  41. }
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