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  1.     #include <stdio.h>
  2.  
  3.     int main() {
  4.     	int n,i,j,z,a = 0,b,c,d,l = 0;
  5.     	scanf("%d", &n);
  6.     	for (i = 0; i < n; ++i) {
  7.     		scanf("%d", &z);
  8.     		if (z > 2) {
  9.     			a = 0;
  10.     			for (j = 0; j < (2*z); ++j) {
  11.     				scanf("%d", &b);
  12.     				if (b < 1 || b > 50)
  13. 						++l;
  14.     				if (j < z)
  15.     					a = a + b;
  16.     				else
  17.     					a = a - b;
  18.     			}	
  19.     			a = 0 - a;
  20.     			if (a % (z-2) == 0 && l==0)
  21.     				printf("%d\n", a/(z-2));
  22. 			    else
  23. 				    printf("-1\n");
  24.     		}
  25.     		else if(z == 2) {
  26.     			scanf("%d%d%d%d", &a, &b, &c, &d);
  27.     			if ((c-a) == (b-d) && !((a < 1)||(b < 1)||(c < 1)||(d < 1)||(a > 50)||(b > 50)||(c > 50)||(d > 50))) {
  28.     				if ((c-a) > 0)
  29.     					printf("%d\n", (c-a));
  30.     				else
  31. 						printf("%d\n", (a-c));
  32.     			}
  33.     			else
  34.     				printf("-1\n");
  35.     		}
  36.     	else {
  37.     		scanf("%d%d", &a, &b);
  38.     		if((a-b) > 0 && !((a < 1) || (b < 1)|| (a > 50) || (b > 50)))
  39.     			printf("%d\n",(a-b));
  40.     		else
  41. 			 	printf("-1\n");
  42.     		}
  43.     	}
  44.     return 0;
  45.     }
Success #stdin #stdout 0s 2252KB
comments (?)
stdin 
3
3
1 1 1
1 1 2
2
1 2
1 3
3
2 2 2
1 3 3
stdout 
1
-1
1
https://ideone.com/axDyHc
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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