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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. #define endl "\n"
  4. #define F first
  5. #define S second
  6. #define loop(a,n) for(int i=a; i<=n ; i++)
  7. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  8. #define NAME ""
  9. using namespace std;
  10. int m, n, negative[100001], zero[100001], a, b, x;
  11. int main(){
  12.     ios_base::sync_with_stdio(0);
  13.     cin.tie(0);cout.tie(0);
  14.     //freopen(NAME".INP","r",stdin);
  15.     //freopen(NAME".OUT","w",stdout);
  16.     negative[0] = 0;
  17.     zero[0] = 0;
  18.     cin >> n >> m;
  19.     loop(1,n) {
  20.         cin >> x;
  21.         if(x < 0) {
  22.             negative[i] = negative[i - 1] + 1;
  23.         } else negative[i] = negative[i - 1];
  24.         if(x == 0) {
  25.             zero[i] = zero [i - 1] + 1;
  26.         } else zero[i] = zero[i - 1];
  27.     }
  28.     while(m--) {
  29.         cin >> a >> b;
  30.         if(zero[b] - zero[a - 1] > 0) cout << 0 << endl;
  31.         else if ((negative[b] - negative[a - 1]) % 2 == 0) cout << "+" << endl;
  32.         else cout << "-" << endl;
  33.     }
  34.     return 0;
  35. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/SqqWvQ
language:
C++ (gcc 8.3)
created:
19 hours ago
visibility:
public

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