Submission #1102921

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102921		MateiKing80	The Collection Game (BOI21_swaps)	C++14	100 / 100	6 ms	804 KiB

swaps

#include <bits/stdc++.h>
#include "swaps.h"

using namespace std;


const int MAXN = 50;
vector<array<int, 2>> ops[MAXN];
int sz, n;

int bitonic(int l, int r, bool inc, int lvl, bool isbitonic)
{
    if(l == r)
        return lvl - 1;
    int md = (l + r) >> 1, mx = lvl - 1;
    if(!isbitonic)
    {
        mx = bitonic(l, md, inc, lvl, 0);
        bitonic(md + 1, r, !inc, lvl, 0);
    }
    for(int i = l; i <= md; i++)
    {
        int x = i, y = i + md + 1 - l;
        if(!inc)
            ops[mx + 1].push_back({x, y});
        else
            ops[mx + 1].push_back({y, x});
    }
    bitonic(l, md, inc, mx + 2, 1);
    return bitonic(md + 1, r, inc, mx + 2, 1);
}

void solve(int N, int v)
{
    n = N;
    if(n == 1)
    {
        answer({1});
        return;
    }
    sz = 1 << (__lg(n - 1) + 1);
    vector<int> a(sz);
    for(int i = 0; i < sz; i++)
        a[i] = i + 1;
    int dep = bitonic(0, sz - 1, 1, 0, 0);
    assert(dep < MAXN);
    for(int j = 0; j < MAXN; j ++)
    {
        if(ops[j].empty()) continue;
        for(auto [x, y] : ops[j])
            if(a[x] <= n && a[y] <= n)
                schedule(a[x], a[y]);
        vector<int> ret = visit();
        int cnt = 0;
        for(auto [x, y] : ops[j])
        {
            if(a[x] > n)
                continue;
            if(a[y] > n)
            {
                swap(a[x], a[y]);
                continue;
            }
            if (ret[cnt])
                swap(a[x], a[y]);
            cnt ++;
        }
    }
    while(a.size() > n)
        a.pop_back();
    answer(a);
}

Compilation message (stderr)

swaps.cpp: In function 'void solve(int, int)':
swaps.cpp:50:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   50 |         for(auto [x, y] : ops[j])
      |                  ^
swaps.cpp:55:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   55 |         for(auto [x, y] : ops[j])
      |                  ^
swaps.cpp:69:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   69 |     while(a.size() > n)
      |           ~~~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3-1: 3 / 3
• Subtask 3-2: 2 / 2
• Subtask 4-1: 9 / 9
• Subtask 4-2: 6 / 6
• Subtask 5-1: 9 / 9
• Subtask 5-2: 6 / 6
• Subtask 6-1: 21 / 21
• Subtask 6-2: 14 / 14
• Subtask 7-1: 9 / 9
• Subtask 7-2: 6 / 6