Submission #908547

#	Time	Username	Problem	Language	Result	Execution time	Memory
908547		dragusanu_rares	Combo (IOI18_combo)	C++14	100 / 100	14 ms	2124 KiB

combo

#include <iostream>
#include "combo.h"
using namespace std;
#define P press
string guess_sequence(int n){
    if(n==1){
        if(P("X"))return "X";
        if(P("Y"))return "Y";
        if(P("A"))return "A";
        return "B";
    }
    char F,a,b,c;
    string S;
    if(P("XY")){
        a='A';
        b='B';
        if(P("X"))F='X';
        else F='Y';
        c='X'+'Y'-F;
    }
    else{
        b='X';
        c='Y';
        if(P("A"))F='A';
        else F='B';
        a='A'+'B'-F;
    }
    S=F;
    while(S.size()<n-1){
        string G=S+b+S+c+a+S+c+b+S+c+c;
        int x=P(G)-S.size();
        if(!x)S+=a;
        else if(x&1)S+=b;
        else S+=c;
    }
    if(P(S+a)==n)return S+a;
    if(P(S+b)==n)return S+b;
    return S+c;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:29:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |     while(S.size()<n-1){
      |           ~~~~~~~~^~~~

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