Submission #719880

#	Time	Username	Problem	Language	Result	Execution time	Memory
719880		AirCircles	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

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

#define PB push_back
typedef vector<int> vec;

string S;

int press(string p){
    int ss=0,best=0;
    for(int i=0;i<p.length();i++){
        if(S[ss]==p[i]){
            ss++;
        }else{
            best=max(best,ss);
            ss=0;
        }
    }
    best=max(best,ss);
    return best;
}

string guess_sequence(int N){
    string s="";
    char a,b,c,d;
    if(press("AB")>0){
        if(press("A")==1){
            a='A';b='B';c='X';d='Y';
        }else{
            a='B';b='A';c='X';d='Y';
        }
    }else{
        if(press("X")==1){
            a='X';b='B';c='A';d='Y';
        }else{
            a='Y';b='B';c='X';d='A';
        }
    }
    s+=a;
    for(int l=1;l<N-1;l++){
        int coin=press(s+c+s+d+b+s+d+c+s+d+d);
        if(coin==l){
            s+=b;
        }else{
            if(coin==l+1){
                s+=c;
            }else{
                s+=d;
            }
        }
    }
  	if(N>1){
    	int coin=press(s+b+s+c);
    	if(coin==N){
    	    if(press(s+b)==N){
    	        s+=b;
    	    }else{
    	        s+=c;
    	    }
    	}else{
    	    s+=d;
    	}
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'int press(std::string)':
combo.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for(int i=0;i<p.length();i++){
      |                 ~^~~~~~~~~~~
/usr/bin/ld: /tmp/ccYr4UNI.o: in function `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
grader.cpp:(.text+0x0): multiple definition of `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'; /tmp/cc1UXM0K.o:combo.cpp:(.text+0x0): first defined here
collect2: error: ld returned 1 exit status