Submission #423752

#	Time	Username	Problem	Language	Result	Execution time	Memory
423752		tqbfjotld	Chameleon's Love (JOI20_chameleon)	C++14	40 / 100	2 ms	456 KiB

chameleon

#include "chameleon.h"
#include <bits/stdc++.h>
using namespace std;

namespace {

int p[505];
int inv[505];
vector<int> adjl[505];

void func(int num, vector<int> opts){
    if (opts.size()==1){
        adjl[num].push_back(opts[0]);
        adjl[opts[0]].push_back(num);
        return;
    }
    random_shuffle(opts.begin(),opts.end()); ///not needed?
    vector<int> lhalf, rhalf;
    for (int x = 0; x<opts.size(); x++){
        if (x<opts.size()/2){
            lhalf.push_back(opts[x]);
        }
        else{
            rhalf.push_back(opts[x]);
        }
    }
    lhalf.push_back(num);
    int res = Query(lhalf);
    if (res!=lhalf.size()){
        lhalf.pop_back();
        func(num,lhalf);
    }
    rhalf.push_back(num);
    res = Query(rhalf);
    if (res!=rhalf.size()){
        rhalf.pop_back();
        func(num,rhalf);
    }
}

}

void Solve(int N) {
    if (N<=50){
        for (int x = 1; x<=2*N; x++){
            for (int y = x+1; y<=2*N; y++){
                int res = Query({x,y});
                if (res==1){
                    adjl[x].push_back(y);
                    adjl[y].push_back(x);
                }
            }
        }
    }
    else{
        vector<int> opt;
        for (int x = N+1; x<=2*N; x++){
            opt.push_back(x);
        }
        for (int x = 1; x<=N; x++){
            func(x,opt);
        }
    }
    for (int x = 1; x<=2*N; x++){
        if (adjl[x].size()==3){
            int res1 = Query({x,adjl[x][0],adjl[x][1]});
            int res2 = Query({x,adjl[x][1],adjl[x][2]});
            int res3 = Query({x,adjl[x][0],adjl[x][2]});
            if (res1==1){
                p[x] = adjl[x][2];
            }
            else if (res2==1){
                p[x] = adjl[x][0];
            }
            else{
                p[x] = adjl[x][1];
            }
            inv[p[x]] = x;
        }
    }
    for (int x = 1; x<=2*N; x++){
        if (adjl[x].size()<3){
            if (x<adjl[x][0]){
                Answer(x,adjl[x][0]);
            }
        }
        else{
            int other = -1;
            for (auto y : adjl[x]){
                if (y==p[x]) continue;
                if (y==inv[x]) continue;
                other = y;
            }
            if (x<other){
                Answer(x,other);
            }
        }
    }
}

Compilation message (stderr)

chameleon.cpp: In function 'void {anonymous}::func(int, std::vector<int>)':
chameleon.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int x = 0; x<opts.size(); x++){
      |                     ~^~~~~~~~~~~~
chameleon.cpp:20:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         if (x<opts.size()/2){
      |             ~^~~~~~~~~~~~~~
chameleon.cpp:29:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     if (res!=lhalf.size()){
      |         ~~~^~~~~~~~~~~~~~
chameleon.cpp:35:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     if (res!=rhalf.size()){
      |         ~~~^~~~~~~~~~~~~~
chameleon.cpp: In function 'void Solve(int)':
chameleon.cpp:68:17: warning: unused variable 'res3' [-Wunused-variable]
   68 |             int res3 = Query({x,adjl[x][0],adjl[x][2]});
      |                 ^~~~

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