Submission #973052

#	Time	Username	Problem	Language	Result	Execution time	Memory
973052		idas	Boarding Passes (BOI22_passes)	C++11	0 / 100	3 ms	348 KiB

passes

#include <bits/stdc++.h>
#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(nullptr)
#define FOR(i, begin, end) for(int i=(begin); i<(end); i++)
#define sz(x) int((x).size())
#define pb push_back
#define s second
#define f first

using namespace std;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef tuple<int, int, int> tiii;
typedef long double ld;
typedef long long ll;

const int INF=1e9;

const int N=1e5+10;
int n;
string s;

int main()
{
    FAST_IO;
    cin >> s; n=sz(s);

    set<char> dif;
    FOR(i, 0, n)
    {
        dif.insert(s[i]);
    }

    int m=sz(dif);

    vector<char> ar(dif.begin(), dif.end());
    ld ans=-1;
    do{
        set<char> v;
        ld tot=0;
        FOR(k, 0, m)
        {
            ld ret=-1;
            FOR(i, -1, n)
            {
                ld now=0;
                int row=0, add=0;
                FOR(j, 0, n)
                {
                    if(j>i) break;
                    if(v.count(s[j])) add++;
                    else if(s[j]==ar[k]){
                        now+=add;

                        row++;
                        now+=row*(row-1)/ld(4);
                    }
//                    cout << j << " ";
                }

                row=0; add=0;
                for(int j=n-1; j>=0; j--){
                    if(j<=i) break;
                    if(v.count(s[j])) add++;
                    else if(s[j]==ar[k]){
                        now+=add;

                        row++;
                        now+=row*(row-1)/ld(4);
                    }
//                    cout << j << " ";
                }
//                cout << '\n';

                if(ret==-1) ret=now;
                else ret=min(ret, now);
            }
            tot+=ret;

            v.insert(ar[k]);
        }
        if(ans==-1) ans=tot;
        else ans=min(ans, tot);
    }
    while(next_permutation(ar.begin(), ar.end()));

    cout << fixed << setprecision(4) << ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 25
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40