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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. const unsigned long long MOD = 1e9 + 7;
  5. const int INF = (int)2e9 + 7;
  6. const long long LINF = (long long)1e18;
  7. const unsigned long long mod1 = 183453789;
  8. const unsigned long long mod2 = 1234567891;
  9. const int P1 = 337, P2 = 263;
  10.  
  11. template<typename T>
  12. T input(){
  13.     T ans = 0, m = 1; char c = ' ';
  14.     while (!((c >= '0' && c <= '9') || c == '-')) c = getchar();
  15.     if (c == '-') m = -1, c = getchar();
  16.     while (c >= '0' && c <= '9') ans = ans * 10 + (c - '0'), c = getchar();
  17.     return ans * m;
  18. }
  19.  
  20. string nextString(bool flag = false){
  21.     char ch; string ans = "";
  22.     do { ch = getchar(); } while(ch <= ' ');
  23.     while(1) {
  24.         ans += ch; ch = getchar();
  25.         if ( (!flag && ch <= ' ') || (flag && ch < ' ') ) break;
  26.     }
  27.     return ans;
  28. }
  29. char nextChar(){
  30.     char ch;
  31.     do {ch = getchar(); } while(ch <= ' ');
  32.     return ch;
  33. }
  34. void read(string& s){ s = nextString(); }
  35. void read(char& c){ c = nextChar(); }
  36. template<typename T> void read(T& a){ a = input<T>(); }
  37. template<typename T, typename... R> void read(T& a, R&... r){ read(a); read(r...); }
  38.  
  39. int32_t main(){
  40.     ios_base::sync_with_stdio(0); cin.tie(0);
  41.     #ifdef LOCAL
  42.         freopen("in.txt", "r", stdin);
  43.         freopen("out.txt", "w", stdout);
  44.     #else
  45.         freopen("pairs.in", "r", stdin);
  46.         freopen("pairs.out", "w", stdout);
  47.     #endif
  48.     long long n, k;
  49.     read(n, k);
  50.     long long l;
  51.     if (k & 1){
  52.         l = (k - 1) / 2;
  53.     } else {
  54.         l = k / 2;
  55.     }
  56.     cout << max(0LL, min(l - (k % 2 == 0), n - l));
  57. }
Time limit exceeded #stdin #stdout 5s 3460KB
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https://ideone.com/Q4vwsX
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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