Submission #112707

#	Time	Username	Problem	Language	Result	Execution time	Memory
112707		imaxblue	Combo (IOI18_combo)	C++17	100 / 100	46 ms	600 KiB

combo

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define pii pair<int, int>
#define p3i pair<pii, int>
#define pll pair<ll, ll>
#define p3l pair<pll, ll>
#define vi vector<int>
#define vpii vector<pii>
#define vp3i vector<p3i>
#define vpll vector<pll>
#define vp3l vector<p3l>
#define lseg L, (L+R)/2, N*2+1
#define rseg (L+R)/2+1, R, N*2+2
#define ub upper_bound
#define lb lower_bound
#define pq priority_queue
#define MN 1000000007
#define fox(k, x) for (int k=0; k<x; ++k)
#define fox1(k, x) for (int k=1; k<=x; ++k)
#define foxr(k, x) for (int k=x-1; k>=0; --k)
#define fox1r(k, x) for (int k=x; k>0; --k)
#define ms multiset
#define flood(x) memset(x, 0x3f3f3f3f, sizeof x)
#define drain(x) memset(x, 0, sizeof x)
#define rng() ((rand() << 14)+rand())
#define scan(X) do{while((X=getchar())<'0'); for(X-='0'; '0'<=(_=getchar()); X=(X<<3)+(X<<1)+_-'0');}while(0)
char _;
#define pi 3.14159265358979323846

string s;
int press(string p);/*{
  fox(l, s.size()){
    if (p.find(s.substr(0, l+1))==string::npos) return l;
  }
  return s.size();
}*/
char st;
string poss = "ABXY", r, q;
string guess_sequence(int N){
  int a1 = (press("AX")>0);
  int a2 = (press("AY")>0);
  if (a1 && a2){
    st = 'A';
  } else if (a1){
    st = 'X';
  } else if (a2){
    st = 'Y';
  } else {
    st = 'B';
  }
  fox(l, 4){
    if (poss[l] == st){
        poss.erase(poss.begin()+l);
        break;
    }
  }
  r += st;
  while(r.size() < N-1){
    q = r + poss[0];
    fox(l2, 3){
      q += r + poss[1]+poss[l2];
    }
    int t = press(q);
    //cout << r << ' ' << t << endl;
    if (t == r.size()){
      r += poss[2];
    } else if (t == r.size() + 1){
      r += poss[0];
    } else if (t == r.size() + 2){
      r += poss[1];
    }
  }
  if (r.size() < N){
    int t = press(r + poss[0]) - r.size();
    int t2 = press(r + poss[1]) - r.size();
    if (t) r += poss[0];
    else if (t2) r+= poss[1];
    else r += poss[2];
  }
  return r;
}/*
int32_t main(){
  s = "ABXXY";
  cout << guess_sequence(5);
  return 0;
}*/

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:63:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   63 |   while(r.size() < N-1){
      |         ~~~~~~~~~^~~~~
combo.cpp:70:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |     if (t == r.size()){
      |         ~~^~~~~~~~~~~
combo.cpp:72:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |     } else if (t == r.size() + 1){
      |                ~~^~~~~~~~~~~~~~~
combo.cpp:74:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |     } else if (t == r.size() + 2){
      |                ~~^~~~~~~~~~~~~~~
combo.cpp:78:16: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   78 |   if (r.size() < N){
      |       ~~~~~~~~~^~~

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