Submission #534407

#	Time	Username	Problem	Language	Result	Execution time	Memory
534407		MrDeboo	Combo (IOI18_combo)	C++17	30 / 100	42 ms	444 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
// #define int long long
using namespace std;
std::string guess_sequence(int n) {
    srand(time(NULL));
    char f[]={'A','B','X','Y'};
    string s;
    bool bl=0;
    for(auto &i:f){
        string g;
        g+=i;
        if(press(g)!=0){bl=1;s+=i;break;}
        if(i=='X')break;
    }
    if(!bl)s+='Y';
    vector<char>ve;
    for(auto &i:f)if(i!=s[0])ve.push_back(i);
    vector<char>v=ve;
    int cnt=0;
    while(s.size()!=n){
        bool bl=0;
        vector<bool>pick(3);
        map<char,bool>mp;
        for(int w=0;w<v.size()-1;w++){
            int f=rand()%3;
            while(pick[f])f=rand()%3;
            pick[f]=1;
            int k=press(s+v[w]+v[f]);
            cnt++;
            if(k==s.size()+1){
                s+=v[w];
                mp[v[f]]=1;
                bl=1;
                break;
            }else if(k==s.size()+2){
                s+=v[w];
                s+=v[f];
                bl=1;
                break;
            }
        }
        if(!bl)s+=v.back();
        vector<char>V;
        for(auto i:ve)if(!mp[i])V.push_back(i);
        v=V;
    }
    return s;
  // std::string p = "";
  // for (int i = 0; i < 4 * N; ++i) {
  //   p += 'A';
  // }
  // int coins = press(p);
  // std::string S = "";
  // for (int i = 0; i < N; ++i) {
  //   S += 'A';
  // }
  // return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:21:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |     while(s.size()!=n){
      |           ~~~~~~~~^~~
combo.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         for(int w=0;w<v.size()-1;w++){
      |                     ~^~~~~~~~~~~
combo.cpp:31:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |             if(k==s.size()+1){
      |                ~^~~~~~~~~~~~
combo.cpp:36:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |             }else if(k==s.size()+2){
      |                      ~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95