Submission #71387069

Source Code Expand

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#include <stdio.h>
#include <inttypes.h>
int N;
int a[312345];
int main(void) {
  int i;
  int64_t ans = 0;
  int start = 0;
  if (scanf("%d", &N) != 1) return 1;
  for (i = 0; i < N; i++) {
    if (scanf("%d", &a[i]) != 1) return 1;
  }
  for (i = 1; i <= N; i++) { /* 最後の要素の次を番兵として用いる */
    if (a[start] != a[i]) {
      int nelems = i - start;
      ans += (int64_t)nelems * (nelems - 1) / 2;
      start = i;
    }
  }
 
 
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#include <stdio.h>
#include <inttypes.h>

int N;
int a[312345];

int main(void) {
	int i;
	int64_t ans = 0;
	int start = 0;
	if (scanf("%d", &N) != 1) return 1;
	for (i = 0; i < N; i++) {
		if (scanf("%d", &a[i]) != 1) return 1;
	}
	for (i = 1; i <= N; i++) { /* 最後の要素の次を番兵として用いる */
		if (a[start] != a[i]) {
			int nelems = i - start;
			ans += (int64_t)nelems * (nelems - 1) / 2;
			start = i;
		}
	}
	printf("%" PRId64 "\n", ans);
	return 0;
}

/*

a_i <= a_j で a_i が a_j の倍数なのは、a_i = a_j のときのみ

*/

Submission Info

Judge Result