Submission #800576

#	Time	Username	Problem	Language	Result	Execution time	Memory
800576		Theo830	Liteh and Newfiteh (INOI20_litehfiteh)	C++17	100 / 100	383 ms	262136 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define ii pair<ll,ll>
#define iii pair<ll,ii>
#define F first
#define S second
ll exo[100005][18][18];
const ll INF = 1e9;
ll dp[100005];
ll n;
ll solve(ll idx){
    if(idx == n){
        return 0;
    }
    if(dp[idx] != -1){
        return dp[idx];
    }
    ll ans = INF;
    f(j,0,18){
        if(idx + (1<<j) > n){
            break;
        }
        ans = min(ans,solve(idx + (1<<j)) + exo[idx][0][j]);
    }
    return dp[idx] = ans;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>n;
    ll arr[n];
    f(i,0,n){
        cin>>arr[i];
    }
    for(ll i = n-1;i >= 0;i--){
        for(ll k = 17;k >= 0;k--){
            exo[i][k][0] = INF;
            if(arr[i] == k){
                exo[i][k][0] = 0;
            }
            if(arr[i] == k+1){
                exo[i][k][0] = 1;
            }
            f(j,1,18){
                exo[i][k][j] = INF;
                if(i + (1<<(j-1)) < n){
                    exo[i][k][j] = min(exo[i][k][j],exo[i][k][j-1] + exo[i + (1<<(j-1))][k][j - 1]);
                    if(k+1 < 18){
                        exo[i][k][j] = min(exo[i][k][j],1 + exo[i][k+1][j-1] + exo[i + (1<<(j-1))][k+1][j - 1]);
                    }
                }
            }
        }
    }
    memset(dp,-1,sizeof dp);
    ll ans = solve(0);
    if(ans == INF){
        ans = -1;
    }
    cout<<ans<<"\n";
}

• Subtask 1: 30 / 30
• Subtask 2: 70 / 70