Submission #209961

#	Time	Username	Problem	Language	Result	Execution time	Memory
209961		my99n	Split the sequence (APIO14_sequence)	C++14	60 / 100	2107 ms	112248 KiB

sequence

#include<bits/stdc++.h>
using namespace std;

long long a[100100], s[100100], dp[2][100100];
vector<int> mxk[2][100100];

void solve (int i, int l, int r, int kmin, int kmax) {
    if (r < l) return;
    int mid = (l+r)/2, m = -1;
    for (int k = kmin; k <= kmax; k++) {
        long long nw = dp[i^1][k] + (s[mid]-s[k])*(s[k]-s[0]);
        if (nw >= dp[i][mid]) {
            dp[i][mid] = nw;
            m = k;
        }
    }
    mxk[i][mid].clear();
    mxk[i][mid].push_back(m);
    for (auto x : mxk[i^1][m]) mxk[i][mid].push_back(x);
    solve(i, l, mid-1, kmin, m); solve(i, mid+1, r, m, kmax);
}

int main(){
    int n, k; scanf("%d %d", &n, &k);
    for (int i = 1; i <= n; i++) scanf("%lld", &a[i]), s[i] = s[i-1]+a[i];
    for (int i = 1; i <= k; i++) solve(i%2, 1, n, 1, n-1);
    printf("%lld\n", dp[k%2][n]);
    for (auto x : mxk[k%2][n]) printf("%d ", x);
    return 0;
}
// 7 3 4 1 3 4 0 2 3

Compilation message (stderr)

sequence.cpp: In function 'int main()':
sequence.cpp:24:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int n, k; scanf("%d %d", &n, &k);
               ~~~~~^~~~~~~~~~~~~~~~~
sequence.cpp:25:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 1; i <= n; i++) scanf("%lld", &a[i]), s[i] = s[i-1]+a[i];
                                  ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 0 / 11
• Subtask 4: 17 / 17
• Subtask 5: 21 / 21
• Subtask 6: 0 / 29