Submission #1204521

#	Time	Username	Problem	Language	Result	Execution time	Memory
1204521		Bui_Quoc_Cuong	Stove (JOI18_stove)	C++20	0 / 100	150 ms	327680 KiB

stove

#include <bits/stdc++.h>
using namespace std;
const int maxn = 100005;
int n, k;
int a[maxn];
namespace sub1
{
    long long dp[5005][5005];
    long long opt[5005][5005];
    void solve()
    {
        memset(dp,0x3f,sizeof dp);
        memset(opt,0x3f,sizeof opt);

//        for(int i=1;i<=n;i++)for(int j=1;j<=k;j++)
//        {
//            for(int v=1;v<=i;v++) dp[i][j]=min(dp[i][j],dp[v-1][j-1] + a[i]+1-a[v]);
//        }
//        cout << dp[n][k];
        dp[0][0] = opt[0][0]=0;
        for(int j=1;j<=k;j++)
        {
            for(int i=1;i<=n;i++)
            {
                opt[i][j-1] = min(opt[i-1][j-1], dp[i-1][j-1] - a[i]);
            }
            for(int i=1;i<=n;i++)
            {
                dp[i][j] = opt[i][j-1] + a[i]+1;
            }
        }
        cout << dp[n][k];
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    freopen("joi18_stove.inp", "r", stdin);
    freopen("joi18_stove.out", "w", stdout);
    cin >> n >> k;
    for(int i=1;i<=n;i++) cin>>a[i];
    sort(a+1,a+1+n);
    return sub1::solve(),0;
    return 0;
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:39:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |     freopen("joi18_stove.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:40:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |     freopen("joi18_stove.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50