39 lines
712 B
C
39 lines
712 B
C
#include <stdio.h>
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#include <stdlib.h>
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int main()
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{
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FILE *fi = fopen("DIVSEQ.INP", "r"), *fo = fopen("DIVSEQ.OUT", "w");
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char t;
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unsigned short n;
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unsigned long d, i, *b, *c;
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long long *a, res;
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fscanf(fi, "%hhd", &t);
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for (; t; t--) {
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fscanf(fi, "%ld %hu", &d, &n);
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a = malloc(n * sizeof(long long));
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for (i = 0; i < n; i++) {
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fscanf(fi, "%Ld", a + i);
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a[i] %= d;
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}
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b = malloc(n * sizeof(long));
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c = calloc(d, sizeof(long));
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for (c[*b = *a % d] += *c = i = 1; i < n; i++)
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c[b[i] = (b[i - 1] + a[i]) % d]++;
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free(a);
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free(b);
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for (res = i = 0; i < d; i++)
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res += c[i] * (c[i] - 1) / 2;
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free(c);
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fprintf(fo, "%Ld\n", res);
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}
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fclose(fi);
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fclose(fo);
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return 0;
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}
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