70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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typedef enum {jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec} months;
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typedef enum {mon, tue, wed, thu, fri, sat, sun} days;
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int main(int argc, char **argv)
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{
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int year, i, limit, count = 0;
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double elapsed;
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struct timespec start, end;
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months month;
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days day;
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clock_gettime(CLOCK_MONOTONIC, &start);
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day = mon;
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month = jan;
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year = 1900;
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while(year < 2001)
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{
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if(month == feb)
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{
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if(i % 400 == 0 || (i % 4 == 0 && i % 100 != 0))
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{
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limit = 29;
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}
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else
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{
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limit = 28;
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}
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}
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else if(month == apr || month == jun || month == sep || month == nov)
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{
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limit = 30;
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}
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else
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{
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limit = 31;
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}
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for(i = 1; i <= limit; i++)
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{
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if(year > 1900 && i == 1 && day == sun)
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{
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count++;
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}
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day = (day + 1) % 7;
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}
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month = (month + 1) % 12;
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if(month == jan)
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{
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year++;
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}
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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 19\n");
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printf("Answer: %d\n", count);
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printf("Elapsed time: %.9lf seconds\n", elapsed);
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return 0;
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}
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