Submission #923914

#	Time	Username	Problem	Language	Result	Execution time	Memory
923914		alexander707070	Chameleon's Love (JOI20_chameleon)	C++14	44 / 100	44 ms	600 KiB

chameleon

#include <bits/stdc++.h>
#include "chameleon.h"
#define MAXN 1007

using namespace std;

namespace {

int n,bad[MAXN],st,lt,rt,mid,li[MAXN],tim;
vector<int> to[MAXN],v[MAXN];
vector< pair<int,int> > sol;

vector<int> l,r,w,perm;

void dfs(int x,int side){
    li[x]=tim;

    if(side==0)l.push_back(x);
    else r.push_back(x);

    for(int i=0;i<v[x].size();i++){
        if(li[v[x][i]]==tim)continue;
        dfs(v[x][i],1-side);
    }
}

}  // namespace


void Solve(int N) {

    n=N;
    for(int i=1;i<=2*n;i++){
        lt=rt=0;
        for(int f=0;f<3;f++){
            st=lt=rt; rt=l.size()+1;
            while(lt+1<rt){
                mid=(lt+rt)/2;

                w.clear();
                for(int e=st;e<mid;e++)w.push_back(l[e]);
                w.push_back(i);

                if(Query(w)!=w.size()){
                    rt=mid;
                }else{
                    lt=mid;
                }
            }

            if(rt!=l.size()+1){
                v[i].push_back(l[rt-1]);
                v[l[rt-1]].push_back(i);
            }
        }

        lt=rt=0;
        for(int f=0;f<3;f++){
            st=lt=rt; rt=r.size()+1;
            while(lt+1<rt){
                mid=(lt+rt)/2;

                w.clear();
                for(int e=st;e<mid;e++)w.push_back(r[e]);
                w.push_back(i);

                if(Query(w)!=w.size()){
                    rt=mid;
                }else{
                    lt=mid;
                }
            }

            if(rt!=r.size()+1){
                v[i].push_back(r[rt-1]);
                v[r[rt-1]].push_back(i);
            }
        }

        l.clear(); r.clear(); tim++;
        for(int f=1;f<=i;f++){
            if(li[f]!=tim)dfs(f,0);
        }
    }

    for(int i=1;i<=2*n;i++){
        to[i]=v[i];
    }

    for(int i=1;i<=2*n;i++){
        if(to[i].size()==1)continue;
        else{
            if(Query({i,to[i][0],to[i][1]})==1)bad[i]=to[i][2];
            else if(Query({i,to[i][0],to[i][2]})==1)bad[i]=to[i][1];
            else if(Query({i,to[i][2],to[i][1]})==1)bad[i]=to[i][0];
        }
    }

    for(int i=1;i<=2*n;i++){
        for(int f:to[i]){
            if(bad[i]==f or bad[f]==i)continue;
            if(i<f)Answer(i,f);
        }
    }
}

/*

4
1 0 1 0 0 1 1 0
4 4 1 2 1 2 3 3
4 3 8 7 6 5 2 1
*/

Compilation message (stderr)

chameleon.cpp: In function 'void {anonymous}::dfs(int, int)':
chameleon.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
chameleon.cpp: In function 'void Solve(int)':
chameleon.cpp:44:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |                 if(Query(w)!=w.size()){
      |                    ~~~~~~~~^~~~~~~~~~
chameleon.cpp:51:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |             if(rt!=l.size()+1){
      |                ~~^~~~~~~~~~~~
chameleon.cpp:67:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |                 if(Query(w)!=w.size()){
      |                    ~~~~~~~~^~~~~~~~~~
chameleon.cpp:74:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |             if(rt!=r.size()+1){
      |                ~~^~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36