Submission #988701

#	Time	Username	Problem	Language	Result	Execution time	Memory
988701		Mighilon	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <combo.h>
#include <bits/stdc++.h>
using namespace std;
 
#define trav(a, x) for(auto &a: x)
#define sz(x) (int)x.size()
 
string guess_sequence(int n){
    string a="ABXY", b="AB", d, s;
    if(!press("AB"))
        d="XY";
    char fc = b[0];
    if(!press(b.substr(0, 1))
        fc=b[1];
    trav(c, a)
        if(c!=fc)
            d+=c;
    s+=fc;
    if(n<=1) return s;
    while(sz(s)<n-1)
        s+=d[press(s+d[1]+s+d[2]+d[0]+s+d[2]+d[1]+s+d[2]+d[2])-sz(s)];
    if(press(s+d[0]+s+d[1])>sz(s)){
        if(press(s+d[0]))
            return s+d[0];
        return s+d[1];
    }
    return s+d[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:13:30: error: expected ';' before 'fc'
   13 |     if(!press(b.substr(0, 1))
      |                              ^
      |                              ;
   14 |         fc=b[1];
      |         ~~                    
combo.cpp:13:8: warning: value computed is not used [-Wunused-value]
   13 |     if(!press(b.substr(0, 1))
      |        ^~~~~~~~~~~~~~~~~~~~~~
combo.cpp:5:20: error: expected primary-expression before 'for'
    5 | #define trav(a, x) for(auto &a: x)
      |                    ^~~
combo.cpp:15:5: note: in expansion of macro 'trav'
   15 |     trav(c, a)
      |     ^~~~
combo.cpp:14:17: error: expected ')' before 'for'
   14 |         fc=b[1];
      |                 ^
      |                 )
combo.cpp:13:7: note: to match this '('
   13 |     if(!press(b.substr(0, 1))
      |       ^