Submission #944017

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
944017	2024-03-12 06:36:20	TAhmed33	Homecoming (BOI18_homecoming)	C++17	100 / 100	150 ms	149736 KiB

homecoming

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#include <bits/stdc++.h>
#include "homecoming.h"
using namespace std;
typedef long long ll;
const int MAXN = 4e6 + 25;
ll dp[MAXN], pref_a[MAXN], pref_b[MAXN];
ll solve (int n, int k, int *A, int *B) {
    for (int i = 0; i < 2 * n; i++) {
        pref_a[i] = pref_b[i] = dp[i] = 0;
    }
    for (int i = 0; i < n; i++) {
        pref_a[i] = A[i] + (i == 0 ? 0 : pref_a[i - 1]);
    }
    for (int i = 0; i < n + k; i++) {
        pref_b[i] = B[i % n] + (i == 0 ? 0 : pref_b[i - 1]);
    }
    ll ret = 0, cur = 0;
    for (int i = 0; i < n; i++) {
        dp[i] = pref_a[i] - pref_b[i + k - 1] + cur;
        if (i) dp[i] = max(dp[i], dp[i - 1]);
        else dp[i] = max(dp[i], 0ll);
        cur = max(cur, dp[i] - pref_a[i] + pref_b[i]);
        ret = max(ret, dp[i]);
    }
    cur = 0;
    for (int i = 0; i < n; i++) {
        dp[i] = pref_a[i] - pref_b[min(n - 1, i + k - 1)] + cur;
        if (i) dp[i] = max(dp[i], dp[i - 1]);
        cur = max(cur, dp[i] - pref_a[i] + pref_b[i]);
    }
 
 
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• Subtask 1: 13 / 13
• Subtask 2: 18 / 18
• Subtask 3: 31 / 31
• Subtask 4: 38 / 38