/**
* author: wxhtzdy
* created: 29.06.2022 21:43:16
**/
#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
vector<int> a(n);
for (int i = 0; i < n; i++) {
cin >> a[i];
}
a[0] = 0;
vector<long long> pref(n + 1);
for (int i = 0; i < n; i++) {
pref[i + 1] = pref[i] + a[i];
}
vector<vector<int>> dp(n + 1, vector<int>(n + 1));
for (int l = 1; l <= n; l++) {
int ptr = l - 1;
long long t = pref[ptr] - pref[ptr - 1];
auto Find = [&](long long x) {
while (ptr > 1 && x > t) {
ptr -= 1;
t += pref[ptr] - pref[ptr - 1];
}
return (x == t ? ptr : 0);
};
vector<int> pref_mx(n + 1);
for (int i = 0; i < l; i++) {
pref_mx[i + 1] = max(pref_mx[i], dp[i][l - 1]);
}
int ft = 0;
for (int r = l; r <= n; r++) {
dp[l][r] = dp[l][r - 1];
if (l < r) {
long long s = pref[r - 1] - pref[l - 1];
int at = Find(s);
if (at >= 1) {
ft += 1;
dp[l][r] = max(dp[l][r], ft + pref_mx[at]);
}
}
}
}
int ans = 0;
for (int i = 1; i <= n; i++) {
ans = max(ans, dp[i][n]);
}
cout << ans << '\n';
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
0 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
340 KB |
Output is correct |
| 13 |
Correct |
0 ms |
340 KB |
Output is correct |
| 14 |
Correct |
0 ms |
340 KB |
Output is correct |
| 15 |
Correct |
0 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
340 KB |
Output is correct |
| 18 |
Correct |
0 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
340 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 3 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 4 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 5 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1236 KB |
Output is correct |
| 7 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 8 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 9 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 10 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 11 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 12 |
Correct |
2 ms |
1236 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
0 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
340 KB |
Output is correct |
| 13 |
Correct |
0 ms |
340 KB |
Output is correct |
| 14 |
Correct |
0 ms |
340 KB |
Output is correct |
| 15 |
Correct |
0 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
340 KB |
Output is correct |
| 18 |
Correct |
0 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
340 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 22 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 23 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 24 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 25 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 26 |
Correct |
3 ms |
1236 KB |
Output is correct |
| 27 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 28 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 29 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 30 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 31 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 32 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 33 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 34 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 35 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 36 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 37 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 38 |
Correct |
3 ms |
1236 KB |
Output is correct |
| 39 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 40 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 41 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 42 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 43 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 44 |
Correct |
2 ms |
1204 KB |
Output is correct |
| 45 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 46 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 47 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 48 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 49 |
Correct |
2 ms |
1236 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
0 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
340 KB |
Output is correct |
| 13 |
Correct |
0 ms |
340 KB |
Output is correct |
| 14 |
Correct |
0 ms |
340 KB |
Output is correct |
| 15 |
Correct |
0 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
340 KB |
Output is correct |
| 18 |
Correct |
0 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
340 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 22 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 23 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 24 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 25 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 26 |
Correct |
3 ms |
1236 KB |
Output is correct |
| 27 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 28 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 29 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 30 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 31 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 32 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 33 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 34 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 35 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 36 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 37 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 38 |
Correct |
3 ms |
1236 KB |
Output is correct |
| 39 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 40 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 41 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 42 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 43 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 44 |
Correct |
2 ms |
1204 KB |
Output is correct |
| 45 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 46 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 47 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 48 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 49 |
Correct |
2 ms |
1236 KB |
Output is correct |
| 50 |
Correct |
195 ms |
98440 KB |
Output is correct |
| 51 |
Correct |
187 ms |
98440 KB |
Output is correct |
| 52 |
Correct |
191 ms |
98384 KB |
Output is correct |
| 53 |
Correct |
187 ms |
98452 KB |
Output is correct |
| 54 |
Correct |
193 ms |
98448 KB |
Output is correct |
| 55 |
Correct |
182 ms |
98420 KB |
Output is correct |
| 56 |
Correct |
225 ms |
98336 KB |
Output is correct |
| 57 |
Correct |
215 ms |
98448 KB |
Output is correct |
| 58 |
Correct |
240 ms |
98452 KB |
Output is correct |
| 59 |
Correct |
240 ms |
98452 KB |
Output is correct |
| 60 |
Correct |
217 ms |
98468 KB |
Output is correct |
| 61 |
Correct |
208 ms |
98424 KB |
Output is correct |
| 62 |
Correct |
198 ms |
98464 KB |
Output is correct |
| 63 |
Correct |
192 ms |
98460 KB |
Output is correct |
| 64 |
Correct |
200 ms |
98356 KB |
Output is correct |
| 65 |
Correct |
205 ms |
98456 KB |
Output is correct |
| 66 |
Correct |
201 ms |
98512 KB |
Output is correct |
| 67 |
Correct |
210 ms |
98364 KB |
Output is correct |
| 68 |
Correct |
184 ms |
98404 KB |
Output is correct |
| 69 |
Correct |
190 ms |
98476 KB |
Output is correct |
| 70 |
Correct |
221 ms |
98380 KB |
Output is correct |
| 71 |
Correct |
215 ms |
98456 KB |
Output is correct |
| 72 |
Correct |
215 ms |
98384 KB |
Output is correct |
