1 files changed, 38 insertions, 0 deletions
diff --git a/others/other/divseq.c b/others/other/divseq.c
new file mode 100644
index 0000000..57b17dd
--- /dev/null
+++ b/others/other/divseq.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+	FILE *fi = fopen("DIVSEQ.INP", "r"), *fo = fopen("DIVSEQ.OUT", "w");
+	char t;
+	unsigned short n;
+	unsigned long d, i, *b, *c;
+	long long *a, res;
+
+	fscanf(fi, "%hhd", &t);
+	for (; t; t--) {
+		fscanf(fi, "%ld %hu", &d, &n);
+		a = malloc(n * sizeof(long long));
+		for (i = 0; i < n; i++) {
+			fscanf(fi, "%Ld", a + i);
+			a[i] %= d;
+		}
+
+		b = malloc(n * sizeof(long));
+		c = calloc(d, sizeof(long));
+		for (c[*b = *a % d] += *c = i = 1; i < n; i++)
+			c[b[i] = (b[i - 1] + a[i]) % d]++;
+		free(a);
+		free(b);
+
+		for (res = i = 0; i < d; i++)
+			res += c[i] * (c[i] - 1) / 2;
+		free(c);
+
+		fprintf(fo, "%Ld\n", res);
+	}
+
+	fclose(fi);
+	fclose(fo);
+	return 0;
+}