Submission #1104584

#	Time	Username	Problem	Language	Result	Execution time	Memory
1104584		koukirocks	Art Collections (BOI22_art)	C++17	100 / 100	1202 ms	1860 KiB

art

#include "art.h"
#include "bits/stdc++.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
//
#define all(x) (x).begin(),(x).end()

namespace {
    using namespace std;
    typedef long long ll;
}

struct BIT {
    int n;
    vector<int> a;
    BIT(int _n):n(_n) {
        a.resize(n+1);
    }
    void update(int x,int v) {
        while (x<=n) {
            a[x]+=v;
            x+=(-x&x);
        }
    }
    int query(int x) {
        ll ans=0;
        while (x) {
            ans+=a[x];
            x-=(-x&x);
        }
        return ans;
    }
};

void solve(int n) {
    vector<int> order(n);
    iota(all(order),1);
    ll org = publish(order);
    BIT b(n);
    vector<int> ans(n);
    for (int i=n;i>=2;i--) {
        vector<int> req(n);
        iota(req.begin()+1,req.begin()+i,1);
        req[0]=i;
        for (int j=i;j<n;j++) req[j]=j+1;
        ll now = publish(req);
        ll dif = (now-org+i+1)/2;
        int l=1,r=n;
        while (l<r) {
            int mid=l+r>>1;
            if (mid-b.query(mid)>=dif) r=mid;
            else l=mid+1;
        }
        ans[l-1]=i;
        b.update(l,1);
    }
    for (int i=0;i<n;i++) {
        if (ans[i]==0) ans[i]=1;
    }
    answer(ans);
}

Compilation message (stderr)

art.cpp: In function 'void solve(int)':
art.cpp:59:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   59 |             int mid=l+r>>1;
      |                     ~^~
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