#include <bits/stdc++.h>
using namespace std;
const int mxN = 1e6 + 123;
int A[mxN], B[mxN], f[mxN], R[mxN];
void Upd(int pos) {
for (int i = pos; i < mxN; i |= i + 1) ++f[i];
}
int Get(int pos) {
int ans = 0;
for (int i = pos; i >= 0; i &= i + 1, --i) ans += f[i];
return ans;
}
int Count(int l, int r) {
return Get(r) - Get(l - 1);
}
int main() {
ios_base :: sync_with_stdio(false); cin.tie(nullptr);
int N; cin >> N;
for (int i = 1; i <= N; ++i) cin >> A[i];
R[N] = N;
for (int i = N - 1; i > 0; i--) {
if (A[i] <= A[i + 1]) R[i] = R[i + 1];
else R[i] = i;
}
set <int> st;
int ans = 0;
for (int i = 1; i <= N; ++i) {
++ans;
if (i == 1) {
for (int j = i; j <= R[i]; ++j) Upd(A[j]), st.insert(A[j]);
i = R[i];
continue;
}
if (A[i] >= *(--st.end())) {
for (int j = i; j <= R[i]; ++j) Upd(A[j]), st.insert(A[j]);
i = R[i];
continue;
}int lb = i, rb = R[i], j = i;
while (rb >= lb) {
int md = (lb + rb) / 2;
// can or not
if (A[md] <= *st.begin()) {
j = md;
lb = md + 1;
continue;
}
int l = *st.upper_bound(A[i]);
int r = *(--st.lower_bound(A[md]));
if (!Count(l, r)) {
j = md;
lb = md + 1;
}else rb = md - 1;
}
for (int k = i; k <= j; ++k) Upd(A[k]), st.insert(A[k]);
i = j;
}
cout << ans;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
364 KB |
Output is correct |
| 8 |
Correct |
1 ms |
364 KB |
Output is correct |
| 9 |
Correct |
1 ms |
492 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
512 KB |
Output isn't correct |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
364 KB |
Output is correct |
| 8 |
Correct |
1 ms |
364 KB |
Output is correct |
| 9 |
Correct |
1 ms |
492 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
512 KB |
Output isn't correct |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
364 KB |
Output is correct |
| 8 |
Correct |
1 ms |
364 KB |
Output is correct |
| 9 |
Correct |
1 ms |
492 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
512 KB |
Output isn't correct |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
364 KB |
Output is correct |
| 8 |
Correct |
1 ms |
364 KB |
Output is correct |
| 9 |
Correct |
1 ms |
492 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
512 KB |
Output isn't correct |
| 11 |
Halted |
0 ms |
0 KB |
- |
