Submission #523859

#	Time	Username	Problem	Language	Result	Execution time	Memory
523859		Killer2501	Holding (COCI20_holding)	C++14	110 / 110	53 ms	25896 KiB

holding

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 1e2+2;
const int M = N*N/4+2;
const int inf = 1e9+7;
const ll mod = 998244353;
int n, t, m, k, ans, tong, a[N], dpr[N][N][M], dpl[N][N][M], l, r;
vector<pll>  adj[N];
vector<ll> vi;
string s;
void sol()
{
    cin >> n >> l >> r >> k;
    for(int i =1 ; i <= n; i ++)
    {
        cin >> a[i];
        if(i >= l && i <= r)tong += a[i];
    }
    k = min(k, n*n/4+2);
    for(int i = l; i <= r; i ++)
    {
        for(int j = l-1; j > 0; j --)
        {
            for(int p = 0; p <= k; p ++)
            {
                dpl[i][j][p] = max(dpl[i-1][j][p], dpl[i][j+1][p]);
                if(p)dpl[i][j][p] = max(dpl[i][j][p], dpl[i][j][p-1]);
                if(i-j <= p)dpl[i][j][p] = max(dpl[i][j][p], dpl[i-1][j+1][p-i+j]+a[i]-a[j]);
                //cout << i <<" "<<j<<" "<<p<<" "<<dpl[i][j][p]<<'\n';
            }
        }
    }
    for(int i = r; i >= l; i --)
    {
        for(int j = r+1; j <= n; j ++)
        {
            for(int p = 0; p <= k; p ++)
            {
                dpr[i][j][p] = max(dpr[i+1][j][p], dpr[i][j-1][p]);
                if(p)dpr[i][j][p] = max(dpr[i][j][p], dpr[i][j][p-1]);
                if(j-i <= p)dpr[i][j][p] = max(dpr[i][j][p], dpr[i+1][j-1][p+i-j]+a[i]-a[j]);
            }
        }
    }
    if(l > 1)ans = dpl[r][1][k];
    if(r < n)ans = max(ans, dpr[l][n][k]);
    if(l > 1 && r < n)
    {
        for(int i = l; i <= r; i ++)
        {
            for(int p = 0; p <= k; p ++)
                ans = max(ans, dpl[i][1][p]+dpr[i+1][n][k-p]);
        }
    }

    cout << tong-ans;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
    }
    int ntest = 1;
    //cin >> ntest;
    while(ntest -- > 0)
    sol();
}

Compilation message (stderr)

holding.cpp: In function 'int main()':
holding.cpp:74:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
holding.cpp:75:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 33 / 33
• Subtask 4: 22 / 22