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  1. /*
  2.   Copyright 2011 Marek "p2004a" Rusinowski
  3.   nth element of Fibonacci sequence (linear)
  4. */
  5. #include <cstdio>
  6.  
  7. int fib(int n, int c) {
  8.   int a = 1, b = 1;
  9.   for (int i = 2; i < n; ++i) {
  10.     int tmp = b;
  11.     b = (a + b) % c;
  12.     a = tmp;
  13.   }
  14.   return b;
  15. }
  16.  
  17. int main() {
  18.   int a, c;
  19.   scanf("%d %d", &a, &c);
  20.   printf("%d\n", fib(a, c));
  21.   return 0;
  22. }
  23.  
stdin
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19 10000000
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
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4181
https://ideone.com/GLZU4
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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