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Submission #64006

# Submission time Handle Problem Language Result Execution time Memory
64006 2018-08-03T08:15:01 Z Just_Solve_The_Problem Homecoming (BOI18_homecoming) C++11
100 / 100
 343 ms 119288 KB 
#include "homecoming.h"
#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int N = (int)2e6 + 7;
const ll linf = (ll)1e18 + 7;

ll pref[N + N];
ll dp[N][2][2];

ll get(int l, int r) {
  if (!l) return pref[r];
  return pref[r] - pref[l - 1];
}

ll solve(int n, int k, int a[], int b[]) {
  pref[0] = b[0];
  for (int i = 0; i < n + n; i++) {
    pref[i + 1] = pref[i] + b[(i + 1) % n];
  }
  for (int i = 0; i < n; i++)
    for (int j = 0; j < 2; j++)
      for (int l = 0; l < 2; l++)
        dp[i][j][l] = -linf;
  dp[0][1][1] = a[0] - pref[k - 1];
  dp[0][0][0] = 0;
  for (int i = 1; i < n; i++) {
    for (int j = 0; j < 2; j++) {
      dp[i][0][j] = max(dp[i - 1][0][j], dp[i - 1][1][j]);
      if (j == 0 || i + k - 1 < n) {
        dp[i][1][j] = max(dp[i - 1][0][j] + a[i] - get(i, i + k - 1), dp[i - 1][1][j] + a[i] - b[(i + k - 1) % n]);
      } else {
        dp[i][1][j] = max(dp[i - 1][0][j] + a[i] - get(i, n - 1), dp[i - 1][1][j] + a[i]);
      }
//      cout << i << ' ' << j << ' ' << dp[i][0][j] << ' ' << dp[i][1][j] << endl;
    }
  }
  ll ans = 0;
  for (int i = 0; i < 2; i++)
    for (int j = 0; j < 2; j++)
      ans = max(ans, dp[n - 1][i][j]);
  return ans;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 3 ms 468 KB Output is correct
3 Correct 3 ms 544 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 3 ms 548 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 3 ms 468 KB Output is correct
3 Correct 3 ms 544 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 3 ms 548 KB Output is correct
6 Correct 4 ms 892 KB Output is correct
7 Correct 4 ms 956 KB Output is correct
8 Correct 4 ms 956 KB Output is correct
9 Correct 3 ms 956 KB Output is correct
10 Correct 2 ms 956 KB Output is correct

Subtask #3
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 87 ms 28044 KB Output is correct
2 Correct 6 ms 28044 KB Output is correct
3 Correct 343 ms 110288 KB Output is correct
4 Correct 7 ms 110288 KB Output is correct
5 Correct 15 ms 110288 KB Output is correct

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 3 ms 468 KB Output is correct
3 Correct 3 ms 544 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 3 ms 548 KB Output is correct
6 Correct 4 ms 892 KB Output is correct
7 Correct 4 ms 956 KB Output is correct
8 Correct 4 ms 956 KB Output is correct
9 Correct 3 ms 956 KB Output is correct
10 Correct 2 ms 956 KB Output is correct
11 Correct 87 ms 28044 KB Output is correct
12 Correct 6 ms 28044 KB Output is correct
13 Correct 343 ms 110288 KB Output is correct
14 Correct 7 ms 110288 KB Output is correct
15 Correct 15 ms 110288 KB Output is correct
16 Correct 336 ms 110288 KB Output is correct
17 Correct 139 ms 110288 KB Output is correct
18 Correct 235 ms 110288 KB Output is correct
19 Correct 231 ms 110288 KB Output is correct
20 Correct 273 ms 119288 KB Output is correct
21 Correct 274 ms 119288 KB Output is correct