Submission #477810

#	Time	Username	Problem	Language	Result	Execution time	Memory
477810		sumit_kk10	Pancake (NOI12_pancake)	C++14	25 / 25	293 ms	12016 KiB

pancake

#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL)
#define ll long long int
#define ld long double
using namespace std;
const int N = 1e6 + 5;
const int MOD = 1e9 + 7;
int n;
map<vector<int>, int> ans;
map<vector<int>, bool> vis;

void solve(){
    cin >> n;
    vector<pair<int, int> > a(n);
    for(int i = 0; i < n; ++i){
        cin >> a[i].first;
        a[i].second = i;
    }
    sort(a.begin(), a.end());
    int ct = 0;
    vector<int> v(n);
    for(int i = 0; i < a.size(); ++i)
        v[a[i].second] = ++ct;
    reverse(v.begin(), v.end());
    cout << ans[v] << "\n";
}

int main(){
    fast;
    vector<int> cur;
    queue<pair<vector<int>, int> > q;
    for(int i = 1; i <= 8; ++i){
        cur.push_back(i);
        q.push({cur, 0});
    }
    while(!q.empty()){
        vector<int> temp = q.front().first;
        int dis = q.front().second;
        q.pop();
        vis[temp] = true;
        ans[temp] = dis;
        for(int i = 1; i < temp.size(); ++i){
            // flipping 0..i;
            vector<int> gar;
            for(int j = i; j >= 0; --j)
                gar.push_back(temp[j]);
            for(int j = i + 1; j < temp.size(); ++j)
                gar.push_back(temp[j]);
            if(vis[gar]) continue;
            vis[gar] = true;
            q.push({gar, dis + 1});
        }
    }
    int t = 1;
    cin >> t;
    while(t--)
        solve();
    return 0;
}

Compilation message (stderr)

pancake.cpp: In function 'void solve()':
pancake.cpp:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for(int i = 0; i < a.size(); ++i)
      |                    ~~^~~~~~~~~~
pancake.cpp: In function 'int main()':
pancake.cpp:42:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         for(int i = 1; i < temp.size(); ++i){
      |                        ~~^~~~~~~~~~~~~
pancake.cpp:47:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |             for(int j = i + 1; j < temp.size(); ++j)
      |                                ~~^~~~~~~~~~~~~

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