Submission #1144290

#	Time	Username	Problem	Language	Result	Execution time	Memory
1144290		Noproblem29	Giraffes (JOI22_giraffes)	C++20	59 / 100	10 ms	1864 KiB

giraffes

#include<bits/stdc++.h>
using namespace std;
#ifndef BADGNU
#pragma GCC target("sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#endif
#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;
#define ll long long
#define int ll
#define ld long double
#define y1 cheza
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
template<class T> using ordered_multiset = tree<T,null_type,less_equal<T>,rb_tree_tag,tree_order_statistics_node_update>;
const int N=305;
const int M=5001;
const int B=447;
const int mod=998244353;
const ll INF=1e18;
const int dx[]={1,-1,0,0};
const int dy[]={0,0,1,-1};
const double eps=1e-6;
int n;
int p[N];
int a[N];
int dp[2][N][N];
void test(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>p[i];
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            dp[0][i][j]=(p[i]==j);
        }
    }
    for(int k=1;k<=n-1;k++){
        int ls=(k-1)%2;
        int rs=k%2;
        for(int i=1;i<=n-k;i++){
            for(int j=1;j<=n-k;j++){
                dp[rs][i][j]=0;
                dp[rs][i][j]=max(dp[rs][i][j],dp[ls][i+1][j+1]+(p[i]==j));

                dp[rs][i][j]=max(dp[rs][i][j],dp[ls][i+1][j]+(p[i]==j+k));

                dp[rs][i][j]=max(dp[rs][i][j],dp[ls][i][j+1]+(p[i+k]==j));

                dp[rs][i][j]=max(dp[rs][i][j],dp[ls][i][j]+(p[i+k]==j+k));
            }
        }
    }
    cout<<n-dp[(n-1)%2][1][1]<<'\n';

}



/*

*/
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    // cout.tie(nullptr);
    int t2=1;
    // cin>>t2;
    for(int i=1;i<=t2;i++){
        test();
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 22 / 22
• Subtask 3: 27 / 27
• Subtask 4: 0 / 41