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Submission #345886

# Submission time Handle Problem Language Result Execution time Memory
345886 2021-01-08T11:56:39 Z Alma Combo (IOI18_combo) C++14
0 / 100
 1 ms 200 KB 
#include <iostream>
#include <vector>
#include <string>
#include <combo.h>
using namespace std;

string guess_sequence(int N) {

    // 100 points: N + 2 calls to "press"
    string p = "";
    string S = "";
    vector<string> v = {};
    int coins = 0;

    // guess 1st letter of S (num of calls to "press" = 2)
    p = "AB"; coins = press(p);
    if (coins >= 1) {
        p = "A"; coins = press(p);
        if (coins == 1) {S = "A"; v = {"B", "X", "Y"};}  // 1st letter = A
        else {S = "B"; v = {"A", "X", "Y"};}             // 1st letter = B
    }
    else {
        p = "X"; coins = press(p);
        if (coins == 1) {S = "X"; v = {"A", "B", "Y"};}  // 1st letter = X
        else {S = "Y"; v = {"A", "B", "X"};}             // 1st letter = Y
    }

    // guess from 2nd letter to N-1 (num of calls to "press" = N-2)
    while (S.length() < N) {
        int i = 1;
        p = S + v[0]+v[0] + S + v[0]+v[1] + S + v[0]+v[2] + S + v[1];
        // f.e. 1st = A      p = SBB SBX SBY SX
        
        coins = press(p);
        if (coins == i+2) {S += v[0];}        // next letter = B  v[0]
        else if (coins == i+1) {S += v[1];}   // next letter = X  v[1]
        else {S += v[2];}                     // next letter = Y  v[2]
        i++;
    }

    // guess last letter of S (num of calls to "press" = 2)
    p = S + v[0]; coins = press(p);
    if (coins == N) {S += v[0];}
    else {
        p = S + v[1]; coins = press(p);
        if (coins == N) {S += v[1];}
        else {S += v[2];}
    }

    // total of calls to "press" = 2 + N-2 + 2 = (N + 2)
    return S;
}

Compilation message

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:29:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |     while (S.length() < N) {
      |            ~~~~~~~~~~~^~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 200 KB Wrong Answer: invalid press
2 Halted 0 ms 0 KB -

Subtask #2
0 / 95.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 200 KB Wrong Answer: wrong guess.
2 Halted 0 ms 0 KB -