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#include <stdio.h>unsigned long longfib(unsigned n){    unsigned long long fibs[] = {1, 1};    unsigned long long t;    for (; n > 1; --n) {        t = fibs[0];        fibs[0] = fibs[1];        fibs[1] += t;    }    return fibs[1];}int main(void){    int i;    for (i = 0; i <= 10; ++i)        printf("%d: %llu\n", i, fib(i));    return 0;}