#include<bits/stdc++.h>
#define fi first
#define se second
#define ll long long
using namespace std ;
const int N = 5e5, NS = 5e3 ;
int n, q, d[N + 1], dp[NS + 1][NS + 1], mx[NS + 1][NS + 1] ;
signed main()
{
ios_base::sync_with_stdio( 0 ) ;
cin.tie( 0 ) ;
cout.tie( 0 ) ;
cin >> n ;
for(int i = 1 ; i <= n ; i++)
cin >> d[i] ;
cin >> q ;
if(n <= 5000)
{
for(int i = 1 ; i <= n ; i++)
for(int j = i ; j <= n ; j++)
mx[i][j] = max(mx[i][j - 1], d[j]) ;
for(int i = 1 ; i <= n - 2 ; i++)
dp[i][i + 2] = d[i] + d[i + 1] + d[i + 2] ;
for(int ln = 4 ; ln <= n ; ln++)
for(int j = 1 ; j <= n - ln + 1 ; j++)
dp[j][j + ln - 1] = max({dp[j][j + ln - 2], dp[j + 1][j + ln - 1], d[j] + d[j + ln - 1] + mx[j + 1][j + (ln - 2) / 2]}) ;
// for(int ln = 3 ; ln <= n ; ln++)
// {
// for(int j = 1 ; j <= n - ln + 1 ; j++)
// cout << dp[j][j + ln - 1] << ' ' ;
// cout << '\n' ;
// }
while(q--)
{
int l, r ;
cin >> l >> r ;
cout << dp[l][r] << '\n' ;
}
return 0 ;
}
if(n <= 100 && q <= 100)
{
while(q--)
{
int l, r, ans = 0 ;
cin >> l >> r ;
for(int b = l + 1 ; b < r ; b++)
for(int a = l ; a < b ; a++)
for(int c = b + (b - a) ; c <= r ; c++)
ans = max(ans, d[a] + d[b] + d[c]) ;
cout << ans << '\n' ;
}
return 0 ;
}
return 0 ;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
332 KB |
Output is correct |
2 |
Incorrect |
1 ms |
1108 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
332 KB |
Output is correct |
2 |
Incorrect |
1 ms |
1108 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
18 ms |
2016 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
332 KB |
Output is correct |
2 |
Incorrect |
1 ms |
1108 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |