Submission #996435

#	Time	Username	Problem	Language	Result	Execution time	Memory
996435		Icelast	Combo (IOI18_combo)	C++17	100 / 100	27 ms	1584 KiB

combo

#include "combo.h"
#include <iostream>
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll maxn = 2*1e5+5, INF = 4e18+9;

std::string guess_sequence(int N) {
    int n = N;
    string ss[4] = {"A", "B", "X", "Y"};
    char c[4] = {'A', 'B', 'X', 'Y'};
    string s;
    string t;
    t = s+"A"+s+"B";
    if(press(t) > s.size()){
        t = s+"A";
        if(press(t) > s.size()){
            s.push_back('A');
        }else{
            s.push_back('B');
        }
    }else{
        t = s+"X";
        if(press(t)){
            s.push_back('X');
        }else{
            s.push_back('Y');
        }
    }
    if(n == 1) return s;
    for(int i = 2; i < n; i++){
        string t;
        int cnt = 0;
        vector<int> d(3);
        for(int j = 0; j <= 3; j++){
            if(s[0] == c[j]) continue;
            if(cnt == 2){
                d[2] = j;
                break;
            }
            if(cnt == 0){
                for(int k = 0; k <= 3; k++){
                    if(s[0] == c[k]) continue;
                    t+=s;
                    t.push_back(c[j]);
                    t.push_back(c[k]);
                }
                d[0] = j;
            }else{
                t+=s;
                t.push_back(c[j]);
                d[1] = j;
            }
            cnt++;
        }

        int res = press(t);
        if(res == 1+s.size()){
            s.push_back(c[d[1]]);
        }else if(res == 2+s.size()){
            s.push_back(c[d[0]]);
        }else{
            s.push_back(c[d[2]]);
        }
    }
    t = s+"A"+s+"B";
    if(press(t) > s.size()){
        t = s+"A";
        if(press(t) > s.size()){
            s.push_back('A');
        }else{
            s.push_back('B');
        }
    }else{
        t = s+"X";
        if(press(t) > s.size()){
            s.push_back('X');
        }else{
            s.push_back('Y');
        }
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:15:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     if(press(t) > s.size()){
      |        ~~~~~~~~~^~~~~~~~~~
combo.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         if(press(t) > s.size()){
      |            ~~~~~~~~~^~~~~~~~~~
combo.cpp:58:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |         if(res == 1+s.size()){
      |            ~~~~^~~~~~~~~~~~~
combo.cpp:60:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         }else if(res == 2+s.size()){
      |                  ~~~~^~~~~~~~~~~~~
combo.cpp:67:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |     if(press(t) > s.size()){
      |        ~~~~~~~~~^~~~~~~~~~
combo.cpp:69:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |         if(press(t) > s.size()){
      |            ~~~~~~~~~^~~~~~~~~~
combo.cpp:76:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |         if(press(t) > s.size()){
      |            ~~~~~~~~~^~~~~~~~~~

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