Submission #731766

#	Time	Username	Problem	Language	Result	Execution time	Memory
731766		Trunkty	Pancake (NOI12_pancake)	C++14	25 / 25	169 ms	11860 KiB

pancake

#include <bits/extc++.h>
using namespace std;
typedef long long ll;
#define int ll

int t;
map<vector<int>,int> best;
int arr[9];

signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
    for(int i=1;i<=8;i++){
        vector<int> v;
        for(int j=i;j>=1;j--){
            v.push_back(j);
        }
        best[v] = 1;
        vector<vector<int>> bfs = {v};
        for(int j=0;j<bfs.size();j++){
            vector<int> x = bfs[j];
            for(int k=0;k<i-1;k++){
                reverse(x.begin()+k,x.begin()+i);
                if(!best[x]){
                    best[x] = best[bfs[j]]+1;
                    bfs.push_back(x);
                }
                reverse(x.begin()+k,x.begin()+i);
            }
        }
    }
    cin >> t;
    for(int e=1;e<=t;e++){
        int n;
        cin >> n;
        vector<int> v;
        map<int,int> mp;
        for(int i=1;i<=n;i++){
            cin >> arr[i];
            v.push_back(arr[i]);
        }
        sort(v.begin(),v.end());
        for(int i=0;i<v.size();i++){
            mp[v[i]] = i+1;
        }
        vector<int> v2;
        for(int i=1;i<=n;i++){
            v2.push_back(mp[arr[i]]);
        }
        cout << best[v2]-1LL << "\n";
    }
	return 0;
}

Compilation message (stderr)

pancake.cpp: In function 'int main()':
pancake.cpp:20:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         for(int j=0;j<bfs.size();j++){
      |                     ~^~~~~~~~~~~
pancake.cpp:43:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         for(int i=0;i<v.size();i++){
      |                     ~^~~~~~~~~

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