Submission #123240

#	Time	Username	Problem	Language	Result	Execution time	Memory
123240		baqargam	Unscrambling a Messy Bug (IOI16_messy)	C++14	100 / 100	4 ms	508 KiB

messy

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

using namespace std;

string base;
vector<int>res;

void ddc(int l,int r){
    //cout<<l<<" "<<r<<endl;
    string s=base;
    int mid=(l+r)/2;
    for(int i=l;i<r;i++){
        s[i]='0';
    }
    for(int i=l;i<mid;i++){
        s[i]='1';
       // cout<<s<<endl;
        add_element(s);
        s[i]='0';
    }
    if(r-l==1)return;
    ddc(l,mid);
    ddc(mid,r);
}

void fnd(int l,int r,vector<int> g){
    if(r-l==1) {res[g[0]]=l;return;}
    vector<int>g1,g2;
    string s=base;
    int mid=(l+r)/2;
    //cout<<l<<" "<<r<<" "<<g.size()<<endl;
    for(int i=0;i<g.size();i++){
       // cout<<g[i]<<" ";
        s[g[i]]='0';
    }
    //cout<<endl;
    for(int i=0;i<g.size();i++){
        s[g[i]]='1';
        int ch=check_element(s);
       // cout<<"? "<<s<<" "<<g[i]<<" "<<ch<<endl;
        if(ch)
            g1.push_back(g[i]);
        else
            g2.push_back(g[i]);
        s[g[i]]='0';
    }
    fnd(l,mid,g1);
    fnd(mid,r,g2);
}

vector<int> restore_permutation(int n, int w, int r) {
    string s="";
    vector<int>g;
    int l=log2(n);
    int gn=1;
    for(int i=0;i<n;i++){
        base+='1';
        g.push_back(i);
        res.push_back(i);
    }
    ddc(0,n);
    compile_set();
    fnd(0,n,g);
    return res;
}

Compilation message (stderr)

messy.cpp: In function 'void fnd(int, int, std::vector<int>)':
messy.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g.size();i++){
                 ~^~~~~~~~~
messy.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g.size();i++){
                 ~^~~~~~~~~
messy.cpp: In function 'std::vector<int> restore_permutation(int, int, int)':
messy.cpp:55:9: warning: unused variable 'l' [-Wunused-variable]
     int l=log2(n);
         ^
messy.cpp:56:9: warning: unused variable 'gn' [-Wunused-variable]
     int gn=1;
         ^~

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30