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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. inline int random_value(int min, int max) {
  5.      static mt19937 random(chrono::system_clock::now().time_since_epoch().count());
  6.      return uniform_int_distribution<int>(min,max)(random); }
  7.  
  8. unordered_map<int,int> dp; int used; 
  9.  
  10. inline int solve(int n, int p = 0) {
  11.     if (n == 1)
  12.         return 1-p; 
  13.     if (n == 2 or n&1)
  14.         return p; 
  15.     auto it = dp.find(n);
  16.     if (it != dp.end()) 
  17.         return ++used, it->second^p;
  18.     int ans = 1-p;
  19.     for (int y, x = 2; x*x <= n; ++x)
  20.         if (n%x == 0) {
  21.             if (x&1 and solve(n/x,1-p) == p) {
  22.                 ans = p; break; }
  23.             if (y = n/x, y > x and y&1 and solve(n/y,1-p) == p) {
  24.                 ans = p; break; } }
  25.     dp[n] = ans^p; 
  26.    return ans; }
  27.  
  28. int main() {
  29.     for (int i = 0; i < 1000000; ++i)
  30.     	solve(random_value(1,1000000000)); 
  31. 	cout << "dp value used " << used << " time(s)"; }
  32.  
Success #stdin #stdout 3.92s 60848KB
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Standard input is empty
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dp value used 1206134 time(s)
https://ideone.com/L6HJEl
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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