Submission #428762

#	Time	Username	Problem	Language	Result	Execution time	Memory
428762		lyc	Cheerleaders (info1cup20_cheerleaders)	C++14	21 / 100	2097 ms	33212 KiB

cheerleaders

#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) ((int)(x).size())
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for(int i=(a);i>=(b);--i)

int N, A[1<<17];

int inv() {
    int cnt = 0;
    FOR(i,0,(1<<N)-1){
        FOR(j,0,i-1){
            if (A[j] > A[i]) ++cnt;
        }
    }
    return cnt;
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0);

    cin >> N;
    FOR(i,0,(1<<N)-1){
        cin >> A[i];
    }

    vector<int> ops;
    while (true) {
        bool done = 1;
        int pos0 = -1;
        FOR(i,0,(1<<N)-1){
            done &= A[i] == i;
            if (A[i] == 0) pos0 = i;
        }
        if (done) break;

        int op;
        if (pos0 < (1<<(N-1))) op = 2;
        else op = 1;
        ops.push_back(op);

        if (op == 1) {
            FOR(i,0,(1<<(N-1))-1){
                swap(A[i],A[i+(1<<(N-1))]);
            }
        } else {
            vector<int> v[2];
            FOR(i,0,(1<<N)-1) v[i&1].push_back(A[i]);
            FOR(i,0,(1<<(N-1))-1) A[i] = v[0][i];
            FOR(i,0,(1<<(N-1))-1) A[i+(1<<(N-1))] = v[1][i];
        }
    }

    cout << 0 << '\n';
    for (int& x : ops) {
        cout << x;
    }
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 10
• Subtask 3: 0 / 25
• Subtask 4: 21 / 21
• Subtask 5: 0 / 28