A. Initial Bet
水题就不说了，记得写完一定要想想有没有特殊情况，注意有不考虑全是0的情况的话会wrong answer on pretest 3
1 #include<cstdio> 2 #include<cstring> 3 #include<cmath> 4 #include<iostream> 5 #include<algorithm> 6 #include<set> 7 #include<map> 8 #include<stack> 9 #include<vector> 10 #include<queue> 11 #include<string> 12 #include<sstream> 13 #define eps 0.000001 14 #define ALL(x) x.begin(),x.end() 15 #define INS(x) inserter(x,x.begin()) 16 using namespace std; 17 typedef long long LL; 18 int i,j,k,n,m,x,y,T,ans,big,cas,sum; 19 bool flag; 20 int main() 21 { 22 for(i=1;i<=5;i++) 23 { 24 scanf("%d",&x); 25 sum+=x; 26 } 27 if (sum%5!=0||sum==0) printf("-1\n"); 28 else printf("%d\n",sum/5); 29 return 0; 30 }