#include <stdio.h>
#include <time.h>
int main() {
clock_t start, end;
double cpu_time_used;
// 执行一些操作
for(int i = 0; i < 1000000000; i++) {
// 示例操作
}
cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
printf("Time used: %f seconds\n", cpu_time_used
); return 0;
}
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