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Submission #866525

# Submission time Handle Problem Language Result Execution time Memory
866525 2023-10-26T10:19:51 Z farica Homecoming (BOI18_homecoming) C++14
0 / 100
 30 ms 24412 KB 
#include "homecoming.h" 
#include <bits/stdc++.h>

using namespace std;

const int MAX_N=2000000;
const int N=2e6+6;
long long dp[N][2];

long long int solve(int N, int K, int *A, int *B) {
    int n=N, k=K;
    cin >> n >> k;
    long long a[n], b[n], pref[n];
    for(int i=0; i<n; ++i) a[i] = A[i];
    for(int i=0; i<n; ++i) {
        b[i] = B[i];
        pref[i] = b[i];
        if(i) pref[i] += pref[i-1];
    }
    long long ans;
    dp[0][0] = -1e18;
    dp[0][1] = a[0] - pref[k-1];
    for(int i=1; i<n; ++i) {
        dp[i][0] = max(dp[i-1][0], dp[i-1][1]);
        long long val1 = dp[i-1][1] + a[i];
        if((i+k-1)<n) val1 -= b[i+k-1];
        long long val2 = dp[i-1][0] + a[i] - pref[min(i+k-1, n-1)] + pref[i-1];
        dp[i][1] = max(val1,val2);
    }
    ans = dp[n-1][1];
    ans = max(ans, dp[n-1][0]);
    dp[0][1] = -1e18;
    dp[0][0] = 0;
    for(int i=1; i<n; ++i) {
        dp[i][0] = max(dp[i-1][0], dp[i-1][1]);
        long long val1 = dp[i-1][1] + a[i] - b[(i+k-1)%n];
        long long val2 = dp[i-1][0] + a[i];
        if((i+k-1)<n) val2 -= pref[i+k-1] - pref[i-1];
        else val2 -= pref[n-1] - pref[i-1] + pref[(i+k-1)%n];
        dp[i][1] = max(val1, val2);
    }
    ans = max(ans, dp[n-1][0]);
    return max(ans, dp[n-1][1]);
}

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 500 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Runtime error 1 ms 600 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 500 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Runtime error 1 ms 600 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 24412 KB Output is correct
2 Runtime error 1 ms 604 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 500 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Runtime error 1 ms 600 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -