oj.uz

Submission #931809

# Submission time Handle Problem Language Result Execution time Memory
931809 2024-02-22T11:11:29 Z boris_mihov Chameleon's Love (JOI20_chameleon) C++17
100 / 100
 44 ms 596 KB 
#include "chameleon.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>
#include <set>

const int MAXN = 1000 + 10;

namespace
{
    int n;
    int perm[MAXN];
    int before[MAXN];
    bool found[2 * MAXN];
    std::vector <int> candidates[MAXN];
    std::vector <int> x, y;
}

int runBinary(int fromPos, std::vector <int> &from, int value)
{
    int l = fromPos - 1, r = from.size(), mid;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        std::vector <int> curr;
        curr.push_back(value);

        for (int j = fromPos ; j <= mid ; ++j)
        {
            curr.push_back(from[j]);
        }

        if (Query(curr) == curr.size()) l = mid;
        else r = mid;
    }

    return r;
}

int timer;
int vis[MAXN];
void rebuild(int node, int side)
{
    if (side == 0)
    {
        x.push_back(node);
    } else
    {
        y.push_back(node);
    }

    vis[node] = timer;
    for (const int &u : candidates[node])
    {
        if (vis[u] != timer)
        {
            rebuild(u, side ^ 1);
        }
    }
}

void Solve(int n) 
{
    ::n = n;
    for (int i = 1 ; i <= 2 * n ; ++i)
    {
        timer++;
        bool shouldTryX = true;
        bool shouldTryY = true;
        x.push_back(i);
        y.push_back(i);

        if (Query(x) == x.size())
        {
            shouldTryX = false;
        }

        if (Query(y) == y.size())
        {
            shouldTryY = false;
        }

        x.pop_back();
        y.pop_back();
        int cntFound = 0;

        if (shouldTryX)
        {
            int lastAdded = -1;
            while (cntFound < 3 && lastAdded + 1 < x.size())
            {
                int curr = runBinary(lastAdded + 1, x, i);
                if (curr != x.size())
                {
                    candidates[i].push_back(x[curr]);
                    candidates[x[curr]].push_back(i);
                    cntFound++;
                }

                lastAdded = curr;
            }
        }

        if (shouldTryY)
        {
            int lastAdded = -1;
            while (cntFound < 3 && lastAdded + 1 < y.size())
            {
                int curr = runBinary(lastAdded + 1, y, i);
                if (curr != y.size())
                {
                    candidates[i].push_back(y[curr]);
                    candidates[y[curr]].push_back(i);
                    cntFound++;
                }

                lastAdded = curr;
            }
        }

        x.clear();
        y.clear();
        for (int u = 1 ; u <= i ; ++u)
        {
            if (vis[u] != timer)
            {
                rebuild(u, 0);
            }
        }
    }

    for (int i = 1 ; i <= 2 * n ; ++i)
    {
        if (candidates[i].size() == 3)
        {
            if (Query({candidates[i][0], candidates[i][2], i}) == 1)
            {
                std::swap(candidates[i].back(), candidates[i][1]);
            } else if (Query({candidates[i][1], candidates[i][2], i}) == 1)
            {
                std::swap(candidates[i].back(), candidates[i][0]);
            }

            candidates[i].pop_back();
        }
    }

    std::iota(perm + 1, perm + 1 + 2 * n, 1);
    std::sort(perm + 1, perm + 1 + 2 * n, [&](int x, int y)
    {
        return candidates[x].size() < candidates[y].size();
    });
    
    for (int idx = 1 ; idx <= 2 * n ; ++idx)
    {
        int i = perm[idx];
        if (found[i])
        {
            continue;
        }

        if (candidates[i].size() == 1)
        {
            Answer(i, candidates[i][0]);
            found[candidates[i][0]] = true;
            continue;
        }
        
        assert(candidates[i].size() == 2);
        bool shouldBreak = false;

        for (const int &j : candidates[i])
        {
            for (const int &x : candidates[j])
            {
                if (x == i)
                {
                    Answer(i, j);
                    found[j] = true;
                    shouldBreak = true;
                    break;
                }
            }
            
            if (shouldBreak)
            {
                break;
            }
        }
    }
}

Compilation message

chameleon.cpp: In function 'int runBinary(int, std::vector<int>&, int)':
chameleon.cpp:35:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if (Query(curr) == curr.size()) l = mid;
      |             ~~~~~~~~~~~~^~~~~~~~~~~~~~
chameleon.cpp: In function 'void Solve(int)':
chameleon.cpp:75:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |         if (Query(x) == x.size())
      |             ~~~~~~~~~^~~~~~~~~~~
chameleon.cpp:80:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |         if (Query(y) == y.size())
      |             ~~~~~~~~~^~~~~~~~~~~
chameleon.cpp:92:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |             while (cntFound < 3 && lastAdded + 1 < x.size())
      |                                    ~~~~~~~~~~~~~~^~~~~~~~~~
chameleon.cpp:95:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |                 if (curr != x.size())
      |                     ~~~~~^~~~~~~~~~~
chameleon.cpp:109:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  109 |             while (cntFound < 3 && lastAdded + 1 < y.size())
      |                                    ~~~~~~~~~~~~~~^~~~~~~~~~
chameleon.cpp:112:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  112 |                 if (curr != y.size())
      |                     ~~~~~^~~~~~~~~~~
chameleon.cpp: At global scope:
chameleon.cpp:15:9: warning: '{anonymous}::before' defined but not used [-Wunused-variable]
   15 |     int before[MAXN];
      |         ^~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 22 ms 344 KB Output is correct
4 Correct 22 ms 512 KB Output is correct
5 Correct 22 ms 596 KB Output is correct
6 Correct 22 ms 344 KB Output is correct
7 Correct 22 ms 512 KB Output is correct
8 Correct 23 ms 344 KB Output is correct
9 Correct 22 ms 504 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 480 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 1 ms 344 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 34 ms 516 KB Output is correct
4 Correct 38 ms 344 KB Output is correct
5 Correct 35 ms 344 KB Output is correct
6 Correct 34 ms 344 KB Output is correct
7 Correct 34 ms 344 KB Output is correct
8 Correct 34 ms 344 KB Output is correct
9 Correct 34 ms 344 KB Output is correct

Subtask #5
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 22 ms 344 KB Output is correct
4 Correct 22 ms 512 KB Output is correct
5 Correct 22 ms 596 KB Output is correct
6 Correct 22 ms 344 KB Output is correct
7 Correct 22 ms 512 KB Output is correct
8 Correct 23 ms 344 KB Output is correct
9 Correct 22 ms 504 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 1 ms 344 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 1 ms 344 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 1 ms 480 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 0 ms 344 KB Output is correct
30 Correct 34 ms 516 KB Output is correct
31 Correct 38 ms 344 KB Output is correct
32 Correct 35 ms 344 KB Output is correct
33 Correct 34 ms 344 KB Output is correct
34 Correct 34 ms 344 KB Output is correct
35 Correct 34 ms 344 KB Output is correct
36 Correct 34 ms 344 KB Output is correct
37 Correct 42 ms 344 KB Output is correct
38 Correct 22 ms 344 KB Output is correct
39 Correct 42 ms 536 KB Output is correct
40 Correct 41 ms 344 KB Output is correct
41 Correct 41 ms 344 KB Output is correct
42 Correct 23 ms 344 KB Output is correct
43 Correct 34 ms 344 KB Output is correct
44 Correct 41 ms 540 KB Output is correct
45 Correct 44 ms 516 KB Output is correct