采用异或...
1 #include<stdio.h> 2 int main() 3 { 4 //freopen("input.txt","r",stdin); 5 int n,s,a; 6 while(scanf("%d",&n),n) 7 { 8 s = 0; 9 while(n--) 10 { 11 scanf("%d",&a); 12 s ^= a; 13 } 14 printf("%d ",s); 15 } 16 17 return 0; 18 }
采用异或...
1 #include<stdio.h> 2 int main() 3 { 4 //freopen("input.txt","r",stdin); 5 int n,s,a; 6 while(scanf("%d",&n),n) 7 { 8 s = 0; 9 while(n--) 10 { 11 scanf("%d",&a); 12 s ^= a; 13 } 14 printf("%d ",s); 15 } 16 17 return 0; 18 }