Submission #1015715

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015715		nisanduu	Combo (IOI18_combo)	C++17	100 / 100	19 ms	2116 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

string guess_sequence(int n){
    string st = "";
    char ct = 'A';
    vector<char> cs = {'A','B','X','Y'};
    for(ll i=0;i<1;i++){
        string sx1 = "",sx2 = "";
        sx1 += cs[0];
        sx1 += cs[1];
        int sc11 = press(sx1);
        if(sc11>0){
            sx1 = "";
            sx1 += (cs[0]);
            sc11 = press(sx1);
            if(sc11>0){
                ct = cs[0];
                st += ct;
            }else{
                ct = cs[1];
                st += ct;
            }
        }else{
            sx1 = "";
            sx1 += (cs[2]);
            sc11 = press(sx1);
            if(sc11>0){
                ct = cs[2];
                st += ct;
            }else{
                ct = cs[3];
                st += ct;
            }
        }
    }
    if(n==1) return st;
    
    string ans = st;
    vector<char> other = {'A','B','X','Y'};
    auto ite = find(other.begin(),other.end(),ct);
    other.erase(ite);
    for(ll i=1;i<n-1;i++){
        string s1 = "",s2 = "";
        s1 += (ans + other[0]);
        for(ll j=0;j<3;j++){
            s2 += ans;
            s2 += other[1];
            s2 += other[j];
        }
        s1 += s2;
        
        int sc1 = press(s1);
        //cout<<s1<<" "<<sc1<<endl;
        if(sc1 == ans.size()+1){
            ans += other[0];
        }else if(sc1 == ans.size()+2){
            ans += other[1];
        }else{
            ans += other[2];
        }
    }
    for(ll i=0;i<2;i++){
        string str1 = ans + other[i];
        int cnttt = press(str1);
        if(cnttt == n) return str1;
    }
    return (ans + other[2]);
    
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:57:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |         if(sc1 == ans.size()+1){
      |            ~~~~^~~~~~~~~~~~~~~
combo.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |         }else if(sc1 == ans.size()+2){
      |                  ~~~~^~~~~~~~~~~~~~~

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