Submission #345874

#	Time	Username	Problem	Language	Result	Execution time	Memory
345874		Alma	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#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<char> 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)
    for (int i = 1; i < N-1; i++) {
        p = S + v[0]+v[0] + S + v[0]+v[1] + S + v[0]+v[2] + S + v[1];
        // f.e. 1st = A      p = S BB S BX S BY S X
        
        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]
    }

    // 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 (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:41:20: error: expected primary-expression before ')' token
   41 |     if (coins == N)) {S += v[0];}
      |                    ^
combo.cpp:44:24: error: expected primary-expression before ')' token
   44 |         if (coins == N)) {S += v[1];}
      |                        ^