bzoj3016[Usaco2012 Nov]Clumsy Cows*

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <algorithm>
 4 #define inc(i,j,k) for(int i=j;i<=k;i++)
 5 using namespace std;
 6 
 7 char ch; int s,ans;
 8 int main(){
 9     ch=getchar();
10     while(ch!=‘\n‘){
11         if(ch==‘(‘)s++; if(ch==‘)‘){s--; if(s<0)s+=2,ans++;} ch=getchar();
12     }
13     ans+=s/2; printf("%d",ans); return 0;
14 }