Submission #110947

#	Time	Username	Problem	Language	Result	Execution time	Memory
110947		CodeKracker	Combo (IOI18_combo)	C++14	100 / 100	50 ms	464 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
#define FOR(i,a,b) for (int i = a; i < b; i++)
#define FORD(i,a,b) for (int i = a; i >= b; i--)
using namespace std;

char gf(){
  int c = press("AB");
  if(c > 0){
    int a = press("A");
    if(a){
      return 'A';
    }else{
      return 'B';
    }
  }else{
    int x = press("X");
    if(x){
      return 'X';
    }else{
      return 'Y';
    }
  }
}

char gl(string ans,vector<char> vec){
  int c = press(ans+vec[0]);
  if(c == ans.length()+1){
    return vec[0];
  }
  c = press(ans+vec[1]);
  if(c == ans.length()+1){
    return vec[1];
  }
  return vec[2];
}

std::string guess_sequence(int n) {
  char f = gf();
  vector<char> rem;
  string opt = "ABXY";
  FOR(i,0,4){
    if(opt[i] != f){
      rem.push_back(opt[i]);
    }
  }
  string ans = "";
  ans += f;
  FOR(i,1,n-1){
    string cur = ans+rem[0]+ans+rem[1]+rem[0]+ans+rem[1]+rem[1]+ans+rem[1]+rem[2];
    int c = press(cur);
    if(c == ans.length()){
      ans += rem[2];
    }else if(c == ans.length()+1){
      ans += rem[0];
    }else{
      ans += rem[1];
    }
  }
  if(n > 1){
    char l = gl(ans,rem);
    ans += l;
  }
  return ans;
}

Compilation message (stderr)

combo.cpp: In function 'char gl(std::string, std::vector<char>)':
combo.cpp:28:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   if(c == ans.length()+1){
      |      ~~^~~~~~~~~~~~~~~~~
combo.cpp:32:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |   if(c == ans.length()+1){
      |      ~~^~~~~~~~~~~~~~~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:52:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     if(c == ans.length()){
      |        ~~^~~~~~~~~~~~~~~
combo.cpp:54:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     }else if(c == ans.length()+1){
      |              ~~^~~~~~~~~~~~~~~~~

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