Submission #604295

#	Time	Username	Problem	Language	Result	Execution time	Memory
604295		krit3379	Art Collections (BOI22_art)	C++17	100 / 100	1588 ms	648 KiB

art

#include<bits/stdc++.h>
#include "art.h"
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define N 10005

int pos[N],fen[N],mi=1e9;
vector<int> v;

void upd(int x,int k){
    while(x<N){
        fen[x]+=k;
        x+=x&-x;
    }
}

int sol(int x){
    int ans=0;
    while(x){
        ans+=fen[x];
        x-=x&-x;
    }
    return ans;
}

int lower(int x){
    int l=1,r=N-1,mid,pos;
    while(l<=r){
        mid=(l+r)/2;
        if(sol(mid)>=x)pos=mid,r=mid-1;
        else l=mid+1;
    }
    return pos;
}

void solve(int n){
    int i,m=5000,pre,now;
    for(i=1;i<=n;i++)v.push_back(i);
    for(i=1;i<N;i++)fen[i]=i&-i;
    pre=publish(v);
    pos[1]=m;
    upd(pos[1],-1);
    for(i=n-1;i>0;i--){
        swap(v[0],v[i]);
        now=publish(v);
        int val=(now-pre)/2+(now-pre)/abs(now-pre);
        if(val<0)val++;
        pos[v[0]]=lower(sol(pos[v[i]])+val);
        upd(pos[v[0]],-1);
        pre=now;
    }
    for(i=1;i<=n;i++)mi=min(mi,pos[i]);
    for(i=1;i<=n;i++)pos[i]-=mi;
    for(i=1;i<=n;i++)v[pos[i]]=i;
    answer(v);
    return ;
}

Compilation message (stderr)

art.cpp: In function 'int lower(int)':
art.cpp:34:12: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |     return pos;
      |            ^~~
art.cpp: In function 'void solve(int)':
art.cpp:49:18: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |         pos[v[0]]=lower(sol(pos[v[i]])+val);
      |         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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