Submission #99895

#	Time	Username	Problem	Language	Result	Execution time	Memory
99895		1Khan	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

// In the name of GOD

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

#define nl '\n'

string guess_sequence(int n){
     string s;
     if(n == 1){
          int p = press("A");
          if(p){
               s += 'A';
               return s;
          }
          p = press("B");
          if(p){
               s += 'B';
               return s;
          }
          p = press("X");
          if(p){
               s += 'x';
               return s;
          }
          p = press("Y");
          if(p){
               s += 'y';
               return s;
          }
     }
     if(n == 2){
          string k[111];
          k[1] = "AB";
          k[2] = "AX";
          k[3] = "AY";
          k[4] = "BX";
          k[5] = "BY";
          k[6] = "BA";
          k[7] = "XA";
          k[8] = "XY";
          k[9] = "XB";
          k[10] = "YA";
          k[11] = "YB";
          k[12] = "YX";
     }
     if(n == 3){
          string k[] = { "ABX",
                         "ABY",
                         "ABB",
                         "AXY",
                         "AXB",
                         "AXX",
                         "AYX",
                         "AYB",
                         "AYY",
                         "BAX",
                         "BAY",
                         "BAA",
                         "BXA",
                         "BXY",
                         "BXX",
                         "BYA",
                         "BYX",
                         "BYY",
                         "XAB",
                         "XAY",
                         "XAA",
                         "XBA",
                         "XBY",
                         "XBB",
                         "XYA",
                         "XYB",
                         "XYY",
                         "YAB",
                         "YAX",
                         "YAA",
                         "YBA",
                         "YBX",
                         "YBB",
                         "YXA",
                         "YXB",
                         "YXX",
                         };
          int w = 0;
          for(int i = 0; ; ++i){
               if(s[i].size() == 0){
                    break;
               }
               int val = press(k[i]);
               w = max(w, val);
               if(w == val){
                    s = k[i];
               }
          }
          
          return s;
     } else{
          s += "ABXY";
          return s;
     }
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:89:24: error: request for member 'size' in 's.std::__cxx11::basic_string<char>::operator[](((std::__cxx11::basic_string<char>::size_type)i))', which is of non-class type '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'}
   89 |                if(s[i].size() == 0){
      |                        ^~~~