oj.uz

Submission #772276

# Submission time Handle Problem Language Result Execution time Memory
772276 2023-07-03T21:12:14 Z Ellinor Swap (BOI16_swap) C++14
100 / 100
 65 ms 5240 KB 
#include <bits/stdc++.h>
using namespace std;

#define rep(i,a,b) for(int i = (a); i < (b); i++)
typedef long long ll;
#define pb push_back
typedef pair<int, int> pii;

int INF = 3e5;

int n;

// graph
vector<bool> edges_up;
vector<bool> edges_down;

vector<int> start;
vector<int> when_ind_fixed;
vector<int> eend;

vector<int> calcs;

bool calc(int node)
{
    //cerr << node << "\n";
    if (when_ind_fixed[node] == INF) return true;

    int left = node * 2;
    if (left < n + 1) {
        // cerr << "left " << left << "\n";
        // cerr << "ed_do " << edges_down[left] << "\n";
        // cerr << "fix " << when_ind_fixed[node] << "\n";
        if (edges_up[left] && when_ind_fixed[node] >= left) {
            //cerr << "pbl\n";
            calcs.pb(left);
        }
    }

    int right = (node * 2) + 1;
    if (right < n + 1) {
        if (edges_up[right] && when_ind_fixed[node] >= right) {
            //cerr << "pbr\n";
            calcs.pb(right);
        }
    }

    return false;
}


int32_t main()
{
    // fast

    cin >> n;
    start.assign(n + 1, -1);

    int a;
    rep(i,1,n + 1){
        cin >> a;
        start[a] = i;
    }

    when_ind_fixed.assign(n + 1, INF);

    edges_up.assign(n + 1, true);
    edges_down.assign(n + 1, true);
    eend.assign(n + 1, -1);

    // .

    rep(i,1,n + 1) // n ?
    {
        //cerr << "REP " << i << " !!!\n";

        int oth_min = INF;

        if (start[i] != 1)
        {
            int other;
            if (((start[i]/2)*2)+1 != start[i]) other = ((start[i]/2)*2)+1;
            else other = ((start[i]/2)*2);

            //cerr << "other " << other << "\n";

            if (when_ind_fixed[start[i]/2] == INF && edges_down[start[i]]) {

                when_ind_fixed[start[i]/2] = start[i];
                edges_down[start[i]] = false;

                eend[start[i]/2] = i;
                continue;
            }

            else if (other < n + 1) {
                // when_ind_fixed[start[i]/2] >= max(start[i], other) -> true , hm 0 , hm start[i] / 2
                if (edges_down[start[i]] && edges_up[other] && when_ind_fixed[start[i]/2] >= max(start[i], other)) {
                    calcs = {};
                    calcs.pb(other);

                    int j = 0;
                    while (j < calcs.size()) {
                        // j < n
                        if (calc(calcs[j])) {
                            oth_min = calcs[j];
                            break;
                        }
                        else j++;
                    }
                }
            }
        }

        int here_min = INF;

        if (edges_up[start[i]]) // 1
        {
            calcs = {};
            calcs.pb(start[i]);

            int j = 0;
            while (j < calcs.size()) {
                if (calc(calcs[j])) {
                    here_min = calcs[j];
                    break;
                }
                else j++;
            }
        }

        if (here_min == INF && oth_min == INF) {
            //cerr << i << "\n";
            // rep(j,1,n+1){
            //     cerr << eend[j] << " ";
            // }
            // cerr << "\n";
        }
        assert(!(here_min == INF && oth_min == INF));

        //cerr << "REP " << i << " here: " << here_min << " oth: " << oth_min << "\n";

        if (oth_min < here_min)
        {
            edges_down[start[i]] = false;
            //

            eend[oth_min] = i;
            when_ind_fixed[oth_min] = oth_min;

            int stop = start[i]/2;
            int j = oth_min;
            while (j != stop)
            {
                //assert(j > stop);
                edges_up[j] = false;
                j = j / 2;
            }
        }

        else
        {
            edges_up[start[i]] = false;

            eend[here_min] = i;
            when_ind_fixed[here_min] = here_min;
            if (here_min == start[i]) when_ind_fixed[here_min] = 0;
            // edges_down[here_min] = false; // hm

            int stop = start[i];
            int j = here_min;
            while (j != stop)
            {
                //assert(j > stop);
                edges_up[j] = false;
                j = j / 2;
            }
        }

        // min oth_min, here_min , node / 2 rec edges, when_ind node

        // eend[] = i;

        //cerr << "REP end " << i << "\n";
        //cerr << "edges_up:\n";
        // rep(j,0,n+1){
        //     cerr << edges_up[j] << " ";
        // }
        // cerr << "\n";
    }

    rep(i, 1, n + 1){
        cout << eend[i] << " ";
    }
    cout << "\n";
}

Compilation message

swap.cpp: In function 'int32_t main()':
swap.cpp:102:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |                     while (j < calcs.size()) {
      |                            ~~^~~~~~~~~~~~~~
swap.cpp:122:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |             while (j < calcs.size()) {
      |                    ~~^~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 300 KB Output is correct
5 Correct 0 ms 212 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 300 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 300 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 300 KB Output is correct
15 Correct 1 ms 296 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 300 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 300 KB Output is correct
15 Correct 1 ms 296 KB Output is correct
16 Correct 15 ms 1460 KB Output is correct
17 Correct 15 ms 1372 KB Output is correct
18 Correct 15 ms 1364 KB Output is correct
19 Correct 14 ms 1380 KB Output is correct
20 Correct 14 ms 1364 KB Output is correct

Subtask #5
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 300 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 300 KB Output is correct
15 Correct 1 ms 296 KB Output is correct
16 Correct 15 ms 1460 KB Output is correct
17 Correct 15 ms 1372 KB Output is correct
18 Correct 15 ms 1364 KB Output is correct
19 Correct 14 ms 1380 KB Output is correct
20 Correct 14 ms 1364 KB Output is correct
21 Correct 65 ms 5196 KB Output is correct
22 Correct 64 ms 5240 KB Output is correct
23 Correct 64 ms 5168 KB Output is correct
24 Correct 60 ms 5168 KB Output is correct
25 Correct 60 ms 5156 KB Output is correct