Submission #1022234

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022234		khome	Combo (IOI18_combo)	C++17	5 / 100	768 ms	262144 KiB

combo

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

using namespace std;

string guess_sequence(int N) {
    vector<char> a;
    a={'A', 'B', 'X','Y'};
    string res, cur;
    char per;
    int ab = press("AB"), bx = press("BX"), id;

    if (ab == 1) {
      if (bx == 1) {per = 'B'; id = 1; res += per;} 
      if (bx == 2) {per = 'B'; id = 1; res += "BX";}
      if (bx == 0) {per = 'A'; id = 0; res += per;}
    }
    else if (ab == 0) {
      if (bx == 1) {per = 'X'; id = 2;}
      else {per = 'Y'; id = 3;}
      res += per;
    }
    else if (ab == 2) {per = 'A'; id = 0; res = "AB";}

    int n = res.size();
    if (n==1){
      if (press(res + a[(id+1)%4] + res + a[(id+2)%4]) == 2) { // id == 3 res = "Y"; press("YAYB") == 1;
        if (press(res + a[(id+1)%4]) == 2) {res += a[(id+1)%4];}
        else res += a[(id+2)%4];
      }
      else { // press("YAYB") == 0;
        res += a[(id+3)%4];
      }
    }
    n = res.size();
    while (n!=N){
      // int ij = -1;
      for (char i : a){
        // ij++;
        n = res.size();
        if (n == N) break;
        if (i != per && i!= res[-1]){
          cur = res;
          // cout << "current = " << res << ' ';
          while (res.size()!=N) res+=i;
          // cout << "now = " << res << ' ';

          int r = press(res);
          // cout << "r = " << r << " n = " << n << ' ';
          if (r > n){
            cur = "";

            for (int j = 0; j < r; j++){
              cur += res[j];
            }
            // cout << "changed = " << cur;
            res = cur;
            // cout << "\n";
            continue;
          }
          res = cur;
          // cout << "\n";
        }
      }
    }
    return res;
    //XYABABYBA
    

    //XYAXYBBXYBYXYBA
    
    
    // int i = 0;
    // if (a[i] != per){ // i = 0  == > a[i] == "A";
    //   if (press(res+a[i]+res+a[(i+1)%4]) == 2){  // press("YAYB") == 1;
    //     if (press(res+a[(i+2)%4]+res+a[(i+1)%4]) == 2) res += a[(i+1)%4]; 
    //     // press("YXYB") == 1;
    //     else res += a[i]; //press("YXYB") == 0;
    //   }
    //   else res += a[(i+2)%4];
    // }
    // cout << res << "\n";



    // while (res.size()!=N){
    //   n = res.size();
      
    // }
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:45:28: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |           while (res.size()!=N) res+=i;
      |                  ~~~~~~~~~~^~~
combo.cpp:32:21: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |         res += a[(id+3)%4];
      |                  ~~~^~~
combo.cpp:42:22: warning: 'per' may be used uninitialized in this function [-Wmaybe-uninitialized]
   42 |         if (i != per && i!= res[-1]){

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