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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int N=101;
  5. long a[N][N],b[N][N],c[N][N];
  6.  
  7. int main(){
  8. 	int r1, r2, c1, c2;
  9. 	while(cin>>r1>>c1>>r2>>c2){
  10. 		if(c1!=r2){
  11. 			cout<<"Error\n";
  12. 			continue;
  13. 		}
  14. 		for(int i=0; i<r1; i++)
  15. 			for(int j=0; j<c2; j++)
  16. 				c[i][j]=0;
  17.  
  18. 		for(int i=0; i<r1; i++)
  19. 			for(int j=0; j<c1; j++)
  20. 				cin>>a[i][j];
  21.  
  22. 		for(int i=0; i<r2; i++)
  23. 			for(int j=0; j<c2; j++)
  24. 				cin>>b[i][j];
  25.  
  26. 		for(int i=0; i<r1; i++){
  27. 			for(int j=0; j<c2; j++){
  28. 				for(int k=0; k<c1; k++)
  29. 					c[i][j]+=a[i][k]*b[k][j];
  30. 			}
  31. 		}
  32.  
  33. 		for(int i=0; i<r1; i++){
  34. 			for(int j=0; j<c2; j++)
  35. 				cout<<c[i][j]<<' ';
  36. 			cout<<'\n';
  37. 		}
  38. 	}
  39. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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3 2 2 3
1 2
3 4
5 6
1 2 3
4 5 6
1 2 3 4
stdout
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9 12 15 
19 26 33 
29 40 51 
Error
https://ideone.com/OMOQCk
d481. 矩陣乘法
language:
C++14 (clang 8.0)
created:
12 days ago
visibility:
public

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