#include<bits/stdc++.h>
#define fi first
#define se second
#define endl "\n"
#define ii pair<int, int>
using namespace std;
const int N = 5e5 + 10;
vector<int> pos[N];
int L[N], R[N];
int minx[N << 2], maxx[N << 2], lazy[N << 2];
void push(int s, int l, int r) {
if (!lazy[s]) return;
minx[s] += lazy[s];
maxx[s] += lazy[s];
if (l != r) {
lazy[s << 1] += lazy[s];
lazy[s << 1 | 1] += lazy[s];
}
lazy[s] = 0;
}
void up(int s, int l, int r, int from, int to, int val) {
push(s, l, r);
if (l > to || r < from) return;
if (from <= l && r <= to) {
lazy[s] = val;
push(s, l, r);
return;
}
int mid = l + r >> 1;
up(s << 1, l, mid, from, to, val);
up(s << 1 | 1, mid + 1, r, from, to, val);
minx[s] = min(minx[s << 1], minx[s << 1 | 1]);
maxx[s] = max(maxx[s << 1], maxx[s << 1 | 1]);
}
int get_min(int s, int l, int r, int from, int to) {
push(s, l, r);
if (l > to || r < from) return 1e9;
if (from <= l && r <= to) return minx[s];
int mid = l + r >> 1;
return min(get_min(s << 1, l, mid, from, to), get_min(s << 1 | 1, mid + 1, r, from, to));
}
int get_max(int s, int l, int r, int from, int to) {
push(s, l, r);
if (l > to || r < from) return -1e9;
if (from <= l && r <= to) return maxx[s];
int mid = l + r >> 1;
return max(get_max(s << 1, l, mid, from, to), get_max(s << 1 | 1, mid + 1, r, from, to));
}
int sequence(int n, vector<int> a) {
int ans = 1;
a.insert(a.begin(), 0);
for(int i = 1; i <= n; i++) pos[a[i]].push_back(i);
for(int i = 1; i <= n; i++) up(1, 0, n, i, i, -i);
for(int val = 1; val <= n; val++) {
pos[val].push_back(n + 1);
int pre = 0;
for(int i = 0; i + 1 < pos[val].size(); i++) {
int cur = pos[val][i];
L[i] = get_min(1, 0, n, 0, cur - 1);
R[i] = get_max(1, 0, n, 0, cur - 1);
int from = get_min(1, 0, n, cur, pos[val][i + 1] - 1);
int to = get_max(1, 0, n, cur, pos[val][i + 1] - 1);
for(int j = i - 1; j >= 0; j--) {
if (max(L[j], from) <= min( R[j], to)) ans = max(ans, i - j + 1);
else if (L[j] > to && to - L[j] + (i - j + 1) * 2 >= 0) ans = max(ans, i - j + 1);
}
}
for(int &j : pos[val]) up(1, 0, n, j, n, 2);
}
return ans;
}
#ifdef ngu
int main() {
freopen ("task.inp", "r", stdin);
freopen ("task.out", "w", stdout);
// int n; cin >> n;
// vector<int> a(n);
// for(int i = 0; i < n; i++) cin >> a[i];
// cout << sequence(n, a);
// cout << sequence(7, {1, 2, 3, 1, 2, 1, 3});
// cout << sequence(9, {1, 1, 2, 3, 4, 3, 2, 1, 1});
cout << sequence(14, {2, 6, 2, 5, 3, 4, 2, 1, 4, 3, 5, 6, 3, 2});
}
#endif // ngu
Compilation message
sequence.cpp: In function 'void up(int, int, int, int, int, int)':
sequence.cpp:34:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
34 | int mid = l + r >> 1;
| ~~^~~
sequence.cpp: In function 'int get_min(int, int, int, int, int)':
sequence.cpp:45:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
45 | int mid = l + r >> 1;
| ~~^~~
sequence.cpp: In function 'int get_max(int, int, int, int, int)':
sequence.cpp:52:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
52 | int mid = l + r >> 1;
| ~~^~~
sequence.cpp: In function 'int sequence(int, std::vector<int>)':
sequence.cpp:68:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
68 | for(int i = 0; i + 1 < pos[val].size(); i++) {
| ~~~~~~^~~~~~~~~~~~~~~~~
sequence.cpp:67:11: warning: unused variable 'pre' [-Wunused-variable]
67 | int pre = 0;
| ^~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
20828 KB |
Output is correct |
2 |
Correct |
5 ms |
20828 KB |
Output is correct |
3 |
Correct |
4 ms |
20828 KB |
Output is correct |
4 |
Correct |
4 ms |
20900 KB |
Output is correct |
5 |
Correct |
4 ms |
20828 KB |
Output is correct |
6 |
Correct |
5 ms |
20824 KB |
Output is correct |
7 |
Correct |
4 ms |
20828 KB |
Output is correct |
8 |
Correct |
4 ms |
20828 KB |
Output is correct |
9 |
Correct |
4 ms |
21080 KB |
Output is correct |
10 |
Correct |
4 ms |
20824 KB |
Output is correct |
11 |
Correct |
4 ms |
20824 KB |
Output is correct |
12 |
Correct |
4 ms |
20828 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
20828 KB |
Output is correct |
2 |
Correct |
5 ms |
20828 KB |
Output is correct |
3 |
Correct |
4 ms |
20828 KB |
Output is correct |
4 |
Correct |
4 ms |
20900 KB |
Output is correct |
5 |
Correct |
4 ms |
20828 KB |
Output is correct |
6 |
Correct |
5 ms |
20824 KB |
Output is correct |
7 |
Correct |
4 ms |
20828 KB |
Output is correct |
8 |
Correct |
4 ms |
20828 KB |
Output is correct |
9 |
Correct |
4 ms |
21080 KB |
Output is correct |
10 |
Correct |
4 ms |
20824 KB |
Output is correct |
11 |
Correct |
4 ms |
20824 KB |
Output is correct |
12 |
Correct |
4 ms |
20828 KB |
Output is correct |
13 |
Correct |
7 ms |
20828 KB |
Output is correct |
14 |
Correct |
8 ms |
20828 KB |
Output is correct |
15 |
Correct |
7 ms |
20928 KB |
Output is correct |
16 |
Correct |
6 ms |
20824 KB |
Output is correct |
17 |
Correct |
7 ms |
20828 KB |
Output is correct |
18 |
Correct |
7 ms |
21028 KB |
Output is correct |
19 |
Correct |
6 ms |
20828 KB |
Output is correct |
20 |
Correct |
6 ms |
20828 KB |
Output is correct |
21 |
Correct |
6 ms |
20828 KB |
Output is correct |
22 |
Correct |
6 ms |
20828 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
20828 KB |
Output is correct |
2 |
Correct |
701 ms |
53536 KB |
Output is correct |
3 |
Correct |
739 ms |
54968 KB |
Output is correct |
4 |
Execution timed out |
2017 ms |
38752 KB |
Time limit exceeded |
5 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
5 ms |
20828 KB |
Output is correct |
2 |
Execution timed out |
2049 ms |
42172 KB |
Time limit exceeded |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
831 ms |
52776 KB |
Output is correct |
2 |
Correct |
860 ms |
53420 KB |
Output is correct |
3 |
Correct |
814 ms |
53676 KB |
Output is correct |
4 |
Correct |
818 ms |
52748 KB |
Output is correct |
5 |
Correct |
783 ms |
54248 KB |
Output is correct |
6 |
Correct |
780 ms |
53232 KB |
Output is correct |
7 |
Correct |
717 ms |
53064 KB |
Output is correct |
8 |
Correct |
717 ms |
53252 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
20828 KB |
Output is correct |
2 |
Correct |
5 ms |
20828 KB |
Output is correct |
3 |
Correct |
4 ms |
20828 KB |
Output is correct |
4 |
Correct |
4 ms |
20900 KB |
Output is correct |
5 |
Correct |
4 ms |
20828 KB |
Output is correct |
6 |
Correct |
5 ms |
20824 KB |
Output is correct |
7 |
Correct |
4 ms |
20828 KB |
Output is correct |
8 |
Correct |
4 ms |
20828 KB |
Output is correct |
9 |
Correct |
4 ms |
21080 KB |
Output is correct |
10 |
Correct |
4 ms |
20824 KB |
Output is correct |
11 |
Correct |
4 ms |
20824 KB |
Output is correct |
12 |
Correct |
4 ms |
20828 KB |
Output is correct |
13 |
Correct |
7 ms |
20828 KB |
Output is correct |
14 |
Correct |
8 ms |
20828 KB |
Output is correct |
15 |
Correct |
7 ms |
20928 KB |
Output is correct |
16 |
Correct |
6 ms |
20824 KB |
Output is correct |
17 |
Correct |
7 ms |
20828 KB |
Output is correct |
18 |
Correct |
7 ms |
21028 KB |
Output is correct |
19 |
Correct |
6 ms |
20828 KB |
Output is correct |
20 |
Correct |
6 ms |
20828 KB |
Output is correct |
21 |
Correct |
6 ms |
20828 KB |
Output is correct |
22 |
Correct |
6 ms |
20828 KB |
Output is correct |
23 |
Correct |
131 ms |
29200 KB |
Output is correct |
24 |
Correct |
156 ms |
28988 KB |
Output is correct |
25 |
Correct |
133 ms |
29204 KB |
Output is correct |
26 |
Correct |
140 ms |
29720 KB |
Output is correct |
27 |
Correct |
139 ms |
29720 KB |
Output is correct |
28 |
Correct |
139 ms |
29716 KB |
Output is correct |
29 |
Correct |
894 ms |
29388 KB |
Output is correct |
30 |
Correct |
901 ms |
29460 KB |
Output is correct |
31 |
Execution timed out |
2033 ms |
28060 KB |
Time limit exceeded |
32 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
20828 KB |
Output is correct |
2 |
Correct |
5 ms |
20828 KB |
Output is correct |
3 |
Correct |
4 ms |
20828 KB |
Output is correct |
4 |
Correct |
4 ms |
20900 KB |
Output is correct |
5 |
Correct |
4 ms |
20828 KB |
Output is correct |
6 |
Correct |
5 ms |
20824 KB |
Output is correct |
7 |
Correct |
4 ms |
20828 KB |
Output is correct |
8 |
Correct |
4 ms |
20828 KB |
Output is correct |
9 |
Correct |
4 ms |
21080 KB |
Output is correct |
10 |
Correct |
4 ms |
20824 KB |
Output is correct |
11 |
Correct |
4 ms |
20824 KB |
Output is correct |
12 |
Correct |
4 ms |
20828 KB |
Output is correct |
13 |
Correct |
7 ms |
20828 KB |
Output is correct |
14 |
Correct |
8 ms |
20828 KB |
Output is correct |
15 |
Correct |
7 ms |
20928 KB |
Output is correct |
16 |
Correct |
6 ms |
20824 KB |
Output is correct |
17 |
Correct |
7 ms |
20828 KB |
Output is correct |
18 |
Correct |
7 ms |
21028 KB |
Output is correct |
19 |
Correct |
6 ms |
20828 KB |
Output is correct |
20 |
Correct |
6 ms |
20828 KB |
Output is correct |
21 |
Correct |
6 ms |
20828 KB |
Output is correct |
22 |
Correct |
6 ms |
20828 KB |
Output is correct |
23 |
Correct |
701 ms |
53536 KB |
Output is correct |
24 |
Correct |
739 ms |
54968 KB |
Output is correct |
25 |
Execution timed out |
2017 ms |
38752 KB |
Time limit exceeded |
26 |
Halted |
0 ms |
0 KB |
- |