Submission #838245

#	Time	Username	Problem	Language	Result	Execution time	Memory
838245		manizare	Street Lamps (APIO19_street_lamps)	C++14	Compilation error	0 ms	0 KiB

street_lamps

#include <bits/stdc++.h> 

#define pb push_back 
#define F first 
#define S second 
#define all(a) a.begin(),a.end() 
#define pii pair<int,int>
using namespace std ;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxn = 1000 + 10 ,  inf = 1e9+10  ;
int pre[maxn][maxn]  ; 
signed main(){
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  cin >>n >> q;
  string s;
  cin >> s; 
  s=  "0" + s;
  for(int i = 1; i <= q ; i++){
    string a ;
    cin >> a; 
    if(a[0] == 't'){
        int x;
        cin >> x; 
        if(s[x] == '0')s[x] = '1' ;
        else s[x] = '0' ; 
    }
    for(int j = 1; j <= n;  j++){
        pre[i][j] = pre[i][j] + (s[j] == '0') ;  
    }
    if(a[0] == 'q'){
        int r , l; 
        cin >> l >> r ; 
        int ans = 0 ;
        for(int j = 1;  j <= i ;j++){
            if(pre[j][r] == pre[j][l-1])ans ++ ;
        }
        cout << ans << "\n" ;
    }
  }
}
/*
 

*/

Compilation message (stderr)

street_lamps.cpp: In function 'int main()':
street_lamps.cpp:14:9: error: 'n' was not declared in this scope; did you mean 'yn'?
   14 |   cin >>n >> q;
      |         ^
      |         yn
street_lamps.cpp:14:14: error: 'q' was not declared in this scope
   14 |   cin >>n >> q;
      |              ^