Submission #155650

#	Time	Username	Problem	Language	Result	Execution time	Memory
155650		HellAngel	Split the sequence (APIO14_sequence)	C++14	33 / 100	162 ms	131076 KiB

sequence

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int maxn = 1e5 + 7;

int n, k, dp[207][maxn], a[maxn], m, prv[207][maxn];

void Solve(int x)
{
    int cur = x - 1;
    for(int i = x; i <= n; i++)
    {
        while(cur + 1 < i && dp[x - 1][cur] + (a[i] - a[cur]) * a[cur] <= dp[x - 1][cur + 1] + (a[i] - a[cur + 1]) * a[cur + 1])
        {
            cur++;
        }
        dp[x][i] = dp[x - 1][cur] + (a[i] - a[cur]) * a[cur];
        prv[x][i] = cur;
    }
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
    cin >> n >> m;
    for(int i = 1; i <= n; i++)
    {
        cin >> a[i];
        a[i] += a[i - 1];
    }
    for(int j = 2; j <= m + 1; j++)
    {
        Solve(j);
    }
    cout << dp[m + 1][n] << '\n';
    vector<int> ans;
    for(int i = m; i >= 1; i--)
    {
        ans.push_back(prv[i + 1][n]);
        n = prv[i + 1][n];
    }
    sort(ans.begin(), ans.end());
    for(auto i: ans) cout << i << ' ';
}

Compilation message (stderr)

sequence.cpp: In function 'int32_t main()':
sequence.cpp:26:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:26:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]

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