Submission #853345

#	Time	Username	Problem	Language	Result	Execution time	Memory
853345		vjudge1	Art Collections (BOI22_art)	C++17	50 / 100	610 ms	1316 KiB

art

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

using namespace std;

int N, original;
vector<int> order;

bool smaller(int a, int b){
    swap(order[a-1], order[b-1]);
    int nw = publish(order);
    swap(order[a-1], order[b-1]);
    if(a < b){
        if(nw < original) {
            return false; //B is smaller.
        } else {
            return true; //A is smaller.
        }
    } else {
        if(nw < original) {
            return true; //A is smaller
        } else {
            return false; //B is smaller.
        }
    }
}

vector<int> merge_sort(int l, int r){
    if(l == r){
        if(l > N) return {};
        else return {l};
    }
    int m = (l + r) / 2;
    vector<int> left = merge_sort(l, m);
    vector<int> right = merge_sort(m + 1, r);
    vector<int> nw;
    int i = 0;
    int j = 0;
    while(i < (int)left.size() || j < (int)right.size()){
        if(i >= (int)left.size()){
            nw.push_back(right[j]); j++;
        }else if(j >= (int)right.size()){
            nw.push_back(left[i]); i++;
        }else{
            if(smaller(left[i], right[j])){
                nw.push_back(left[i]); i++;
            }else{
                nw.push_back(right[j]); j++;
            }
        }
    }
    return nw;
}

void solve(int n) {
    N = n;
    order.resize(N);
    for(int i = 0; i < N; i++) order[i] = i + 1;
    original = publish(order);
    int pw = 1;
    while(pw < N) pw *= 2;
    vector<int> ans = merge_sort(1, pw);
    answer(ans);
}

Compilation message (stderr)

interface.cpp: In function 'int publish(std::vector<int>)':
interface.cpp:20:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   20 |     if(v.size() != N) {
      |        ~~~~~~~~~^~~~
interface.cpp: In function 'void answer(std::vector<int>)':
interface.cpp:36:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     if(v.size() != N) {
      |        ~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30