Submission #721847

#	Time	Username	Problem	Language	Result	Execution time	Memory
721847		MDSPro	Art Collections (BOI22_art)	C++17	100 / 100	2116 ms	744 KiB

art

#include "art.h"
//
// --- Sample implementation for the task art ---
//
// To compile this program with the sample grader, place:
//     art.h art_sample.cpp sample_grader.cpp
// in a single folder, then open the terminal in this directory (right-click onto an empty spot in the directory,
// left click on "Open in terminal") and enter e.g.:
//     g++ -std=c++17 art_sample.cpp sample_grader.cpp
// in this folder. This will create a file a.out in the current directory which you can execute from the terminal
// as ./a.out
// See task statement or sample_grader.cpp for the input specification
//
#include <iostream>
#include <algorithm>
#include <numeric>
#include <random>
#include <ctime>
#include <set>

using namespace std;
 
int pub(vector<int> p){
    p.erase(p.begin());
    return publish(p);
}
 
void solve(int N) {
    vector<int> pos(N+1); pos[1] = 0;
    vector<int> p(N+1); iota(p.begin(),p.end(),0);
    int x = pub(p);

    set<int> plus,minus;
    for(int i = N; i >= 2; --i){
        int a1 = x;
        swap(p[1],p[i]);
        int a2 = pub(p);
        swap(p[1],p[i]);

        int dis = (abs(a1-a2)-1)/2+1;
        if(a1-a2 > 0) {
            for(int j = 1; j <= dis; ++j) if(minus.count(j)) dis++;
            minus.insert(dis);
            pos[i] = pos[1]-dis;
            // cerr << i << ' ' << -dis << '\n';
        } else {
            for(int j = 1; j <= dis; ++j) if(plus.count(j)) dis++;
            plus.insert(dis);
            pos[i] = pos[1]+dis; 
            // cerr << i << ' ' << +dis << '\n';
        }
    }
    
    vector<pair<int,int>> vv;
    for(int i = 1; i <= N; ++i) {
        vv.emplace_back(pos[i],i);
    }
    sort(vv.begin(),vv.end());

    vector<int> d;
    for(auto z: vv) d.push_back(z.second);
    answer(d);
}

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: 20 / 20
• Subtask 6: 30 / 30