2016-2017 CT S03E05: Codeforces Trainings Season 3 Episode 5 (2016 Stanford Local Programming Contest, Extended) B

链接：http://codeforces.com/gym/101116

学弟做的，以后再补

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#include <iostream> #include <stdio.h> #include <cstring> #include <string> using namespace std; int a[505]; int main(){     int T;     cin>>T;     string s[505];     while(T--){         memset(a,0,sizeof(a));         int n,m,ans=0;         cin>>n>>m;         for(int i=0;i<n;i++){             cin>>s[i];         }         for(int i=0;i<n;i++){             int cnt=0;             for(int k=m-1;k>=0;k--){                 int x=s[i][k]-'0';                 if((x+a[k]+cnt)%2==0){                     ans++;                     cnt++;                     a[k]++;                 }             }         }         cout<<ans<<endl;     } }