Submission #712790

#	Time	Username	Problem	Language	Result	Execution time	Memory
712790		Marslai24	Combo (IOI18_combo)	C++17	100 / 100	28 ms	608 KiB

combo

#include <bits/stdc++.h>
using namespace std;
//#define int long long // a.k.a. TLE creator
#define all(x) x.begin(), x.end()
template<class A, class B> istream& operator >>(istream &o, pair<A, B> &x){return o >> x.first >> x.second;}
template<class A, class B> ostream& operator <<(ostream &o, pair<A, B> &x){return o << x.first << ' ' << x.second << ' ';}
void setIO(){ios::sync_with_stdio(false); cin.tie(0);}
//const int INF = 2e18, MOD = 998244353, N = 1e6 + 1, K = __lg(N) + 2;

int press(string p);

string guess_sequence(int n){
    string chr[4]{"A", "B", "X", "Y"};
    string ans;
    if(press(chr[0] + chr[1])){
        if(press(chr[1]))
            swap(chr[0], chr[1]);
    }else{
        if(press(chr[2]))
            swap(chr[0], chr[2]);
        else swap(chr[0], chr[3]);
    }
    ans += chr[0];
    if(n == 1)return ans;
    for(int len = 2; len < n; len++){
        int cur = press(ans + chr[1] + ans + chr[2] + chr[1] + ans + chr[2] + chr[2] + ans + chr[2] + chr[3]);
        if(cur == ans.size() + 1)ans += chr[1];
        else if(cur == ans.size() + 2)ans += chr[2];
        else ans += chr[3];
    }
    if(press(ans + chr[1]) == n)ans += chr[1];
    else if(press(ans + chr[2]) == n)ans += chr[2];
    else ans += chr[3];
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:27:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         if(cur == ans.size() + 1)ans += chr[1];
      |            ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:28:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         else if(cur == ans.size() + 2)ans += chr[2];
      |                 ~~~~^~~~~~~~~~~~~~~~~

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