Submission #153351

#	Time	Username	Problem	Language	Result	Execution time	Memory
153351		Ruxandra985	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include <cstdio>
#include <cstring>
#include "combo.h"


char next (char ch){
    if (ch == 'A' || ch == 'X')
        return ch + 1;
    if (ch == 'B')
        return 'X';
    return 'A';
}

string guess_sequence (int n){
    int i,j;
    char curr,fst,scd,thd;
    string ask,sol;

    ask.clear();
    ask.push_back('A');
    ask.push_back('B');
    if (press(ask)){
        /// e A sau B
        ask.clear();
        ask.push_back('A');
        if (press(ask))
            curr = 'A';
        else curr = 'B';
    }
    else {
        /// e X sau Y
        ask.clear();
        ask.push_back('X');
        if (press(ask))
            curr = 'X';
        else curr = 'Y';
    }
    /// 2 interogari
    /// curr e primul caracter
    sol.clear();
    sol.push_back(curr);
    fst = next(curr);
    scd = next(fst);
    thd = next(scd);
    for (i=2;i<n;i++){
        ask.clear();
        for (j=0;j<sol.size();j++){
            ask.push_back(sol[j]);
        }
        ask.push_back(fst);
        ask.push_back(fst);

        for (j=0;j<sol.size();j++){
            ask.push_back(sol[j]);
        }
        ask.push_back(fst);
        ask.push_back(scd);

        for (j=0;j<sol.size();j++){
            ask.push_back(sol[j]);
        }
        ask.push_back(fst);
        ask.push_back(thd);

        for (j=0;j<sol.size();j++){
            ask.push_back(sol[j]);
        }
        ask.push_back(scd);

        int x = press(ask) - (i-1);
        if (x == 2)
            sol.push_back(fst);
        else if (x == 1)
            sol.push_back(scd);
        else sol.push_back(thd);

    }
    /// n - 2 interogari
    /// total : n interogari
    /// acum pt ultimul caracter
    ask.clear();
    for (j=0;j<sol.size();j++){
        ask.push_back(sol[j]);
    }
    ask.push_back('A');
    for (j=0;j<sol.size();j++){
        ask.push_back(sol[j]);
    }
    ask.push_back('B');
    if (press(ask) == n){
        /// e A sau B
        ask.clear();
        for (j=0;j<sol.size();j++){
            ask.push_back(sol[j]);
        }
        ask.push_back('A');
        if (press(ask)==n)
            sol.push_back('A');
        else sol.push_back('B');
    }
    else {
        /// e X sau Y
        ask.clear();
        for (j=0;j<sol.size();j++){
            ask.push_back(sol[j]);
        }
        ask.push_back('X');
        if (press(ask)==n)
            sol.push_back('X');
        else sol.push_back('Y');
    }
    return sol;
}

Compilation message (stderr)

combo.cpp:14:1: error: 'string' does not name a type; did you mean 'stdin'?
   14 | string guess_sequence (int n){
      | ^~~~~~
      | stdin