#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e6;
int n;
int a[maxn + 5];
int bit[maxn + 1];
void upd(int k, int v) {
k++;
for ( ; k <= n; k += (k & -k))
bit[k] += v;
}
int qry(int k) {
k++;
int ret = 0;
for (; k; k -= (k & -k))
ret += bit[k];
return ret;
}
int main() {
// freopen("main.in", "r", stdin);
cin >> n;
for (int i = 0; i < n; i++)
cin >> a[i];
// figure out nondecreasing sequences
int l = 0;
int ans = 0;
for (int i = 0; i < n; i++) {
if (i == n - 1 || a[i + 1] < a[i]) {
// [l, i]
for (int j = l + 1; j <= i; j++) {
if (qry(j) - qry(j - 1))
ans++;
}
for (int j = l; j <= i; j++) {
upd(j, 1);
}
ans++;
l = i + 1;
}
}
cout << ans << endl;
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |