Submission #1116464

#	Time	Username	Problem	Language	Result	Execution time	Memory
1116464		Nipphitch	Pancake (NOI12_pancake)	C++14	20 / 25	1054 ms	7132 KiB

pancake

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
const int N=1e5+5;
const int INF=1e9+7;

int n;
vector <int> a,b;
map <vector <int>,int> dp[10];

int rec(int d,vector <int> v){
    if(v==b) return d;
    if(d==n) return INF;
    if(dp[d].find(v)!=dp[d].end()) return dp[d][v];
    int res=INF;
    for(int i=0;i<n-1;i++){
        reverse(v.begin()+i,v.end());
        res=min(res,rec(d+1,v));
        reverse(v.begin()+i,v.end());
    }
    return dp[d][v]=res;
}

void slove(){
    a.clear();
    b.clear();
    for(int i=0;i<10;i++) dp[i].clear();
    cin >> n;
    for(int i=1;i<=n;i++){
        int x;
        cin >> x;
        a.push_back(x);
        b.push_back(x);
    }
    sort(b.begin(),b.end(),greater <int>());
    cout << rec(0,a) << "\n";
}

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int tc;
    cin >> tc;
    while(tc--) slove();
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 8 / 8
• Subtask 5: 0 / 5