为什么错了?????789. 数的范围
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2020-05-26 23:36:29
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789. 数的范围
#include <cstdio>
using namespace std;
const int N = 100010;
int a[N];
int main()
{
int n, q;
scanf("%d%d", &n, &q);
for (int i = 0; i < n; i ++ ) scanf("%d", &a[i]);
while (q -- )
{
int x;
scanf("%d", &x);
int l = 0, r = n - 1;
while (l < r)
{
int mid = l + r >> 1;
if (a[mid] >= x) r = mid;
l = mid + 1;
}
if (a[l] != x) printf("-1 -1\n");
else
{
printf("%d ", l);
int l = 0, r = n - 1;
while (l < r)
{
int mid = l + r + 1 >> 1;
if (a[mid] <= x) l = mid;
else r = mid - 1;
}
printf("%d\n", l);
}
}
return 0;
}
谢谢
第一个二分少写一个 else
l = mid + 1;
应改为else l = mid + 1;