Submission #1006885

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006885		GTA	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
#define fr(m,n,k) for(int m=n;m<=k;m++)
#define sz size()
#define all(v) v.begin(), v.end()

int n;
string guess_sequence(int N) {
  n = N;
  string v = "ABXY";
  string p;

  int a;
  fr(j, 0, 3) {
    p = v[j];
    int x = press(p);
    if (x == 1) {
      a = j;
      break;
    }
    if (j == 2) {
      a = 3;
      break;
    }
  }
  p = v[a];

  vector<int> sisa = {0, 1, 2, 3}; sisa.erase(find(all(sisa), a));
  fr(i, 2, n) {
    fr(x, 0, 2) {
      p += v[sisa[x]];
      int x = press(p);
      if (x == i) break;
      else p.erase(--p.end());

      if (x == 1) {
        p += v[sisa[2]];
        break;
      }
    }
  }
  return p;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:33:11: error: redeclaration of 'int x'
   33 |       int x = press(p);
      |           ^
combo.cpp:31:8: note: 'int x' previously declared here
   31 |     fr(x, 0, 2) {
      |        ^
combo.cpp:4:27: note: in definition of macro 'fr'
    4 | #define fr(m,n,k) for(int m=n;m<=k;m++)
      |                           ^