Submission #731328

#	Time	Username	Problem	Language	Result	Execution time	Memory
731328		peteza	Combo (IOI18_combo)	C++14	100 / 100	38 ms	648 KiB

combo

#include <bits/stdc++.h>
using namespace std;

int press(string p);

string str, toq;
char chrs[5] = "ABXY";

string guess_sequence(int N) {
    if(press("AB")) {
        if(press("A")) str = 'A';
        else str = 'B';
    } else {
        if(press("X")) str = 'X';
        else str = 'Y';
    }
    if(N == 1) return str;
    for(int i=0;i<=2;i++) if(str[0] == chrs[i]) swap(chrs[i], chrs[i+1]);
    for(int i=0;i<N-2;i++) {
        toq = str + chrs[0] + chrs[0] + str + chrs[0] + chrs[1] + str + chrs[0] + chrs[2] + str + chrs[1];
        int req = press(toq);
        if(req == str.size()) str += chrs[2];
        else if(req == str.size() + 1) str += chrs[1];
        else str += chrs[0];
    }
    for(int i=0;i<2;i++) {
        if(press(str + chrs[i]) == N) return str + chrs[i];
    }
    return str + chrs[2];
}

/*
int press(string p) {
    cout << p;
    int x; cin >> x; return x;
}

int main() {cout << guess_sequence(5);}
*/

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:22:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         if(req == str.size()) str += chrs[2];
      |            ~~~~^~~~~~~~~~~~~
combo.cpp:23:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         else if(req == str.size() + 1) str += chrs[1];
      |                 ~~~~^~~~~~~~~~~~~~~~~

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