Submission #500473

#	Time	Username	Problem	Language	Result	Execution time	Memory
500473		Khizri	Combo (IOI18_combo)	C++17	0 / 100	1 ms	268 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string x="ABXY",y="ABXY";
int k=0;
char ask(string ans,int n){
    string p="";
    p+=ans;
    p+=x[0];
    for(int i=0;i<x.size();i++){
        p+=ans;
        p+=x[1];
        p+=x[i];
    }
    int k=press(p);
    if(k==ans.size()+1){
        return x[0];
    }
    else if(k==ans.size()+2){
        return x[1];
    }
    else{
        return x[2];
    }
}
string guess_sequence(int n) {
    string ans="";
    int l=0,r=x.size()-1;
    while(l<=r){
        int m=(l+r)/2;
        string a="";
        for(int i=l;i<=m;i++){
            a+=x[i];
        }
        if(press(a)){
            r=m-1;
        }
        else{
            l=m+1;
        }
    }
    ans+=x[r+1];
    x.erase(x.begin()+r+1);
    for(int i=1;i<n-1;i++){
        ans+=ask(ans,n);
    }

    l=0,r=x.size()-1;
    while(l<=r){
        int m=(l+r)/2;
        string a=ans;
        for(int i=l;i<=m;i++){
            a+=x[i];
        }
        if(press(a)==ans.size()+1){
            r=m-1;
        }
        else{
            l=m+1;
        }
    }
    ans+=x[r+1];
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'char ask(std::string, int)':
combo.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<x.size();i++){
      |                 ~^~~~~~~~~
combo.cpp:16:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     if(k==ans.size()+1){
      |        ~^~~~~~~~~~~~~~
combo.cpp:19:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     else if(k==ans.size()+2){
      |             ~^~~~~~~~~~~~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:55:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         if(press(a)==ans.size()+1){
      |            ~~~~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95