Submission #444424

#	Time	Username	Problem	Language	Result	Execution time	Memory
444424		blue	The Collection Game (BOI21_swaps)	C++17	21 / 100	68 ms	412 KiB

swaps

#include "swaps.h"
#include <vector>
#include <iostream>
using namespace std;

int N;
int V;

vector<int> r;

void do_comparisons(vector<int> A, vector<int> B)
{
    vector<int> a, b;
    for(int i = 0; i < A.size(); i++)
    {
        if(0 <= A[i] && A[i] < N && 0 <= B[i] && B[i] < N)
        {
            a.push_back(A[i]);
            b.push_back(B[i]);
        }
    }

    if(a.size() == 0) return;

    for(int i = 0; i < a.size(); i++)
    {
        schedule(r[ a[i] ], r[ b[i] ]);
    }

    vector<int> C = visit();

    for(int i = 0; i < a.size(); i++)
    {
        if(C[i] == 0)
            swap(r[ a[i] ], r[ a[i] ]);
    }
}


void solve(int n, int v)
{
    N = n;
    V = v;
    r = vector<int>(N);
    for(int i = 1; i <= N; i++) r[i - 1] = i;


    for(int v = 1; v <= min(V, N); v++)
    {
        vector<int> A, B;
        if(v % 2 == 0)
        {
            for(int i = 0; i+1 < N; i += 2)
            {
                A.push_back(i);
                B.push_back(i+1);
            }
        }
        else
        {
            for(int i = 1; i+1 < N; i += 2)
            {
                A.push_back(i);
                B.push_back(i+1);
            }
        }

        do_comparisons(A, B);
    }

    // for(int X = 2; X <= N; X *= 2)
    // {
    //     // cerr << "X = " << X << '\n';
    //     int p = 0, q = X-1;
    //     vector<int> A, B;
    //     while(p < N)
    //     {
    //         for(int i = 0; i < X/2; i++)
    //         {
    //             if(p + i < N && 0 <= q - i && q - i < N)
    //             {
    //                 A.push_back(p + i);
    //                 B.push_back(q - i);
    //             }
    //         }
    //
    //         p += X;
    //         q += X;
    //     }
    //
    //     do_comparisons(A, B);
    //     A.clear();
    //     B.clear();
    //
    //
    //
    //
    //     for(int Y = X/2; Y >= 2; Y /= 2)
    //     {
    //         for(int i = 0; i + Y/2 < N; i++)
    //         {
    //             if((i / (Y/2)) % 2 == 0)
    //             {
    //                 A.push_back(i);
    //                 B.push_back(i + Y/2);
    //             }
    //         }
    //         do_comparisons(A, B);
    //         A.clear();
    //         B.clear();
    //     }
    // }

    answer(r);
}

Compilation message (stderr)

swaps.cpp: In function 'void do_comparisons(std::vector<int>, std::vector<int>)':
swaps.cpp:14:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i = 0; i < A.size(); i++)
      |                    ~~^~~~~~~~~~
swaps.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for(int i = 0; i < a.size(); i++)
      |                    ~~^~~~~~~~~~
swaps.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for(int i = 0; i < a.size(); i++)
      |                    ~~^~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 3 / 3
• Subtask 4: 0 / 2
• Subtask 5: 9 / 9
• Subtask 6: 0 / 6
• Subtask 7: 9 / 9
• Subtask 8: 0 / 6
• Subtask 9: 0 / 21
• Subtask 10: 0 / 14
• Subtask 11: 0 / 9
• Subtask 12: 0 / 6