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  1. /*
  2.   Copyright 2011 Marek "p2004a" Rusinowski
  3.   Exponentiation by squaring
  4. */
  5. #include <cstdio>
  6.  
  7. int pow (int a, int b, int c) {
  8.   if (!b) return 1;
  9.   int tmp = pow(a, b/2, c);
  10.   return (((tmp * tmp) % c) * (b & 1 ? a : 1)) % c;
  11. }
  12.  
  13. int main() {
  14.   int a, b, c;
  15.   scanf("%d %d %d", &a, &b, &c);
  16.   printf("%d\n", pow(a, b, c));
  17.   return 0;
  18. }
  19.  
stdin
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2 16 1000000
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
stdout
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65536
https://ideone.com/4RbJv
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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