39 lines
736 B
C
39 lines
736 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <gmp.h>
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int main(int argc, char **argv)
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{
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double elapsed;
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struct timespec start, end;
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mpz_t fact, r, sum;
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clock_gettime(CLOCK_MONOTONIC, &start);
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mpz_inits(fact, r, sum, NULL);
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mpz_fac_ui(fact, 100);
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mpz_set_ui(sum, 0);
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while(mpz_cmp_ui(fact, 0))
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{
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mpz_tdiv_qr_ui(fact, r, fact, 10);
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mpz_add(sum, sum, r);
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}
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clock_gettime(CLOCK_MONOTONIC, &end);
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elapsed=(end.tv_sec-start.tv_sec)+(double)(end.tv_nsec-start.tv_nsec)/1000000000;
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printf("Project Euler, Problem 20\n");
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gmp_printf("Answer: %Zd\n", sum);
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printf("Elapsed time: %.9lf seconds\n", elapsed);
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mpz_clears(fact, r, sum, NULL);
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return 0;
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}
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