LYDSY 1800
题目大意
暂无
题目解法
暂无
RTFC
#include <cstdio>
int len[25], ans;
int main()
{
int n;
scanf("%d", &n);
for (int i = 1; i <= n; i++) scanf("%d", &len[i]), len[i] += len[i - 1];
for (int i = 0 + 1; i <= n; i++)
for (int j = i + 1; j <= n; j++)
for (int k = j + 1; k <= n; k++)
for (int l = k + 1; l <= n; l++)
if (len[j] - len[i] == len[l] - len[k] && len[n] - len[l] + len[i] == len[k] - len[j])
ans++;
printf("%d", ans);
return 0;
}