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  1. #include <vector>
  2. #include <list>
  3. #include <map>
  4. #include <set>
  5. #include <queue>
  6. #include <deque>
  7. #include <stack>
  8. #include <bitset>
  9. #include <algorithm>
  10. #include <functional>
  11. #include <numeric>
  12. #include <utility>
  13. #include <sstream>
  14. #include <iostream>
  15. #include <iomanip>
  16. #include <cstdio>
  17. #include <cmath>
  18. #include <cstdlib>
  19. #include <ctime>
  20. #include <cstring>
  21. #include <math.h> 
  22. #define lli long long int
  23.  
  24.  
  25.  
  26. using namespace std;
  27.  
  28. int main(){
  29. 	int n;
  30. 	cin >> n;
  31. 	lli a[n][n];
  32. 	int i = 0;
  33. 	int j = 0;
  34. 	int x, y;
  35. 	lli xsum = 0;
  36. 	lli ysum = 0;
  37. 	lli diag1 = 0;
  38. 	lli diag2 = 0;
  39. 	lli checksum = 0;
  40. 	for(int i = 0; i < n; i++){
  41. 		for(int j = 0; j < n; j++){
  42. 			cin >> a[i][j];
  43. 			if(a[i][j] == 0){
  44. 				x = i;
  45. 				y = j;
  46. 			}
  47. 		}
  48. 	}
  49. 	for(int j = 0; j < n; j++){
  50. 		xsum += a[x][j];
  51. 		checksum += a[x+1][j];
  52. 	}
  53. 	for(int j = 0; j < n; j++){
  54.  
  55. 		ysum += a[j][y];
  56. 	}
  57. 	int f = n-1;
  58. 	int t = 0;
  59. 	diag1 = a[0][0];
  60. 	diag2 = a[n-1][0];
  61. 	if(x == y){
  62. 		for(int i = 0; i < n; i++){
  63. 			for(int j = 1; j < n-1; j++){
  64. 				diag1 += a[i+1][j];
  65. 			}
  66.  
  67. 		}
  68.  
  69. 		if(diag1 == xsum && xsum == ysum){
  70. 			cout << abs(xsum - checksum);
  71. 			return 0;
  72. 		}
  73. 		else{
  74. 			cout << -1;
  75. 			return 0;
  76. 		}
  77. 	}
  78. 	else if(abs(f-y) == abs(x-t)){
  79. 		for(int i = n-1; i > 1; i--){
  80. 			for(int j = 1; j < n-2; j++){
  81. 				diag2 += a[i][j];
  82. 			}
  83. 		}
  84.  
  85. 		if(diag2 == xsum && xsum == ysum){
  86. 			cout << abs(xsum - checksum);
  87. 			return 0;
  88. 		}
  89. 		else{
  90. 			cout << -1;
  91. 			return 0;
  92. 		}
  93. 	}
  94. 	else{
  95. 		if(xsum == ysum){
  96. 			cout << abs(checksum - xsum) << endl;
  97.  
  98. 		}
  99.  
  100. 	}
  101.  
  102.  
  103. }
  104.  
  105.  
  106.  
  107.  
  108.  
  109.  
  110.  
  111.  
Success #stdin #stdout 0s 3472KB
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https://ideone.com/ymynPJ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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