Submission #636403

#	Time	Username	Problem	Language	Result	Execution time	Memory
636403		Son	Combo (IOI18_combo)	C++14	0 / 100	1 ms	208 KiB

combo

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

string guess_sequence( int N ){

    vector < char > V;
    V.push_back('A');
    V.push_back('B');
    V.push_back('Y');
    V.push_back('X');

    string ans = "";
    int ab = press("AB");
    if ( ab == 2 ){
        ans = "AB";
    } else if ( ab == 1 ){
        ab = press("A");
        if ( ab == 1 ) ans = "A";
        else ans = "B";
    } else {
        int xy = press("XY");
        if ( xy == 2 ){
            ans = "XY";
        } else if ( xy == 1 ) {
            xy = press("X");
            if ( xy == 1 ) ans = "X";
            else ans = "Y";
        } else {
            assert(1==2);
        }
    }

    int ch;
    vector < char > W;
    for ( int i = 0; i < 4; i++ ){
        if ( V[i] == ans[0] ){
            ch = i;
        } else {
            W.push_back(V[i]);
        }
    }
    while ( ans.size() < N ){
        string t = ans + W[0] + "" + W[1];
        int p = press(t);
        if ( p == ans.size() + 2 ){
            ans += W[0] + W[1];
        } else if ( p == ans.size() + 1 ){
            ans += W[0];
        } else if ( p == ans.size() ) {
            ans += W[2];
        } else {
            assert(1==2);
        }
    }
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:43:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |     while ( ans.size() < N ){
      |             ~~~~~~~~~~~^~~
combo.cpp:46:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         if ( p == ans.size() + 2 ){
      |              ~~^~~~~~~~~~~~~~~~~
combo.cpp:48:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |         } else if ( p == ans.size() + 1 ){
      |                     ~~^~~~~~~~~~~~~~~~~
combo.cpp:50:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         } else if ( p == ans.size() ) {
      |                     ~~^~~~~~~~~~~~~
combo.cpp:34:9: warning: variable 'ch' set but not used [-Wunused-but-set-variable]
   34 |     int ch;
      |         ^~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95