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  1. #include <bits/stdc++.h>
  2. #include <ext/pb_ds/assoc_container.hpp>
  3. #include <ext/pb_ds/tree_policy.hpp>
  4.  
  5. using namespace std;
  6. using namespace __gnu_pbds;
  7. using ll = long long;
  8. using ld = long double;
  9.  
  10. #define all(x)  x.begin(),x.end()
  11. #define v(x) vector<x>
  12. #define nl '\n'
  13. #define fxd(x) fixed << setprecision(x)
  14. template<class t> using ordered_set = tree<t, null_type, less<t>, rb_tree_tag, tree_order_statistics_node_update>;
  15. template<class t> using ordered_multiset = tree<t, null_type, less_equal<t>, rb_tree_tag, tree_order_statistics_node_update>;
  16.  
  17.  
  18. ll fastpower(ll a , ll b ,ll m)
  19. {
  20.     ll ret = 1;
  21.     while (b > 0)
  22.     {
  23.         if(b&1) ret = ((ret%m) * (a%m))%m;
  24.         a = ((a%m) * (a%m))%m;
  25.         b /= 2; 
  26.     }
  27.     return ret;
  28. }
  29.  
  30.  
  31. int main()
  32. {
  33.     ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  34.     int n ; cin >> n;
  35.     while (n--)
  36.     {
  37.         ll a , b; cin >> a >> b;
  38.         cout << fastpower(a,b,10) << nl; 
  39.     }
  40.  
  41. }
Success #stdin #stdout 0.02s 5324KB
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https://ideone.com/MLQFIy
language:
C++ (gcc 8.3)
created:
13 hours ago
visibility:
public

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