int fib(int n) { int a = 0, b = 1, c, i; if (n == 0) return a; for (i = 2; i <= n; i++) { c = a + b; a = b; b = c; } return b; } int fib(int n) { if (n <= 1) return n; return fib(n - 1) + fib(n - 2); }
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