3 solutions
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1
这个题第二个数据是个坑,但是给我提了个醒
我们定义,l,r的时候可以比右边界多一,因为l<r,r是取不到的,而第二个数据的答案就是L,我一开始定义的r=L,结果答案总是差1,所以我把r=L+1,一开就过了.
#include<iostream> using namespace std; const int N1 = 1e5 + 5; int L, N, M; int a[N1]; bool check(int x) { int cnt = 0, now = 0;//now表示当前位置 for (int i = 1; i <= N; ++i) { if (a[i] - now < x)cnt++; else now = a[i]; } return cnt <= M; } int main() { scanf("%d%d%d", &L, &N, &M); for (int i = 1; i <= N; ++i)scanf("%d", &a[i]); int l = 0, r = L + 1, mid;//这里的r不能开成L,只能是L+1 while (l < r) { mid = (l + r) >> 1; if (check(mid)) l = mid + 1; else r = mid; } printf("%d\n", r - 1); return 0; }
Information
- ID
- 252
- Time
- 1000ms
- Memory
- 256MiB
- Difficulty
- 4
- Tags
- # Submissions
- 236
- Accepted
- 47
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