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  1. /*
  2.   Copyright 2011 Marek "p2004a" Rusinowski
  3.   Exponentiation by squaring (iterative)
  4. */
  5. #include <cstdio>
  6.  
  7. int pow (int a, int b, int c) {
  8.   int d = a, res = 1;
  9.   while (b) {
  10.     res = (res * (b & 1 ? d : 1)) % c;
  11.     b >>= 1;
  12.     d = (d * d) % c;
  13.   }
  14.   return res;
  15. }
  16.  
  17. int main() {
  18.   int a, b, c;
  19.   scanf("%d %d %d", &a, &b, &c);
  20.   printf("%d\n", pow(a, b, c));
  21.   return 0;
  22. }
  23.  
stdin 
2 7 1000000
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
stdout 
128
https://ideone.com/Ub814
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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