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  1. #include <stdio.h>
  2. int getNQ(int *t, int p, int n, int m){
  3. 	int i,cnt=0,k[12]={0};
  4. 	for(i=m-1;i>0;i--){
  5. 		if(p-i>-1 && t[p-i]==m-i) return 0;
  6. 	}
  7. 	for(i=m-1;i>0;i--){
  8. 		if(p+i<n && t[p+i]==m-i) return 0;
  9. 	}
  10. 	if(m==n) return 1;
  11. 	t[p]=m++;
  12. 	for(i=0;i<n;i++){
  13. 		if(t[i]==0) cnt+=getNQ(t,i,n,m);
  14. 	}
  15. 	t[p]=0;
  16. 	return cnt;
  17. }
  18. int main(void) {
  19. 	int c, n, t[12], i, cnt;
  20. 	scanf("%d",&c);
  21. 	while(c--){
  22. 		scanf("%d",&n);
  23. 		cnt = 0;
  24. 		for(i=0;i<n;i++) t[i]=0;
  25. 		for(i=0;i<n/2;i++) cnt += getNQ(t,i,n,1);
  26. 		cnt*=2;
  27. 		if(n%2==1) cnt += getNQ(t,i,n,1);
  28. 		printf("%d\n",cnt);
  29. 	}
  30. 	return 0;
  31. }
  32. /*
  33. #include <stdio.h>
  34. #include <stdlib.h>
  35. int getNQ(int *t, int p, int n, int m){
  36. 	int i,cnt=0,k[12]={0};
  37. 	if(m==n) return 1;
  38. 	t[p]=m++;
  39. 	for(i=0;i<n;i++){
  40. 		if(t[i]!=0){
  41. 			k[i]=1;
  42. 			if(i-(m-t[i])>=0) k[i-(m-t[i])]=1;
  43. 			if(i+(m-t[i])<n) k[i+(m-t[i])]=1;
  44. 		}
  45. 	}
  46. 	for(i=0;i<n;i++){
  47. 		if(k[i]==0) cnt+=getNQ(t,i,n,m);
  48. 	}
  49. 	t[p]=0;
  50. 	return cnt;
  51. }
  52. int main(void) {
  53. 	int c, n, t[12], i, cnt;
  54. 	scanf("%d",&c);
  55. 	while(c--){
  56. 		scanf("%d",&n);
  57. 		cnt = 0;
  58. 		for(i=0;i<n;i++) t[i]=0;
  59. 		for(i=0;i<n/2;i++) cnt += getNQ(t,i,n,1);
  60. 		cnt*=2;
  61. 		if(n%2==1) cnt += getNQ(t,i,n,1);
  62. 		printf("%d\n",cnt);
  63. 	}
  64. 	return 0;
  65. }
  66. */
Success #stdin #stdout 0.1s 3344KB
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https://ideone.com/JEBxmp
NQUEEN
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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