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- #include <stdio.h>
- int main() {
- int t, d, n, i, j;
- double m, o, p;
- scanf("%d", &t);
- for (i = 0; i < t; i++) {
- scanf("%d %d", &d, &n);
- o = 0;
- for (j = 0; j < n; j++) {
- scanf("%lf", &m);
- p = d-m*(int)(d/m);
- if (p > o && p < d) {
- o = p;
- }
- }
- printf("%.2lf\n", o);
- }
- return 0;
- }
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