Faster solutions with ios_base::sync_with_stdio(0); C++ Codeforces Round #460 (Div. 2), problem: (C) Seat Arrangements solution

I learned the faster way the hard way. Use

ios_base::sync_with_stdio(0);

in your code. My

#include <cstdio>
#include <iostream>
using namespace std;

int main() {
     ios_base::sync_with_stdio(0);
 int n, m, k, row[2005]={0}, col[2005]={0}, ans=0;
 char ch;
 cin>>n>>m>>k;
 for(int i=1; i<=n; i++) for(int j=1; j<=m; j++) {
  cin>>ch;
  if(ch=='.') {
   row[i]++;
   col[j]++;
  }
  else if(ch=='*'){
   row[i]=0;
   col[j]=0;
  }
  if(row[i]>=k) ans++;
  if(col[j]>=k) ans++;
 }
 if(k==1) ans/=2;
 cout<<ans;
 return 0;
}

code passed but similar C++ code got TLE without ios base sync stdio. That is my 2 satoshis(cents :) for you.