Submission #1085370

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085370		mingga	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

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

using namespace std;

#define ln "\n"
#define dbg(x) cout << #x << " = " << x << ln
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define inf 2e18
#define fast_cin()                  \
  ios_base::sync_with_stdio(false); \
  cin.tie(NULL)
#define out(file) freopen(file, "w", stdout)
#define in(file) freopen(file, "r", stdin)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
// #define int long long
int MOD = 1e9 + 7;

char d[4] = {'A', 'B', 'X', 'Y'};

string guess_sequence(int n) {
  string ans = "";
  char fir;
  for(int i = 0; i < 4; i++) {
    string cur = "";
    cur  += d[i];
    // cout << cur << ln;
    if(press(cur) == 1) {
      ans += d[i];
      fir = d[i];
      break;
    } 
  }
  vector<char> vec;
  for(int i = 0; i < 4; i++) {
    if(d[i] == fir) continue;
    vec.pb(d[i]);
  }
  ans += 'A';
  for(int i = 1; i < n; i++) {
      string tmp = ans + vec[0] + ans + vec[1];
      // cout << tmp << ln;
      int cur = press(tmp);
      if(cur == sz(ans)) {
        ans += vec[2];
      } else {
        string tmp = ans + vec[0];
        int cur = press(tmp);
        if(cur == sz(ans)) ans += vec[1];
        else ans += vec[0];
      }
  }
  return ans;
}

signed main() {
  guess_sequence(4);
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:40:5: warning: 'fir' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |     if(d[i] == fir) continue;
      |     ^~
/usr/bin/ld: /tmp/ccD4NGsf.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc4tqv2d.o:combo.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status