Submission #466802

#	Time	Username	Problem	Language	Result	Execution time	Memory
466802		jazzup	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include<iostream>
#include<cstring>

int press(std::string s){
	int r;
	std::cout<<s<<"\n";
	std::cin>>r;
	return r;
}

std::string guess_sequence(int N){
	std::string p = "";

	p="AB";
	char a[3];
	int m = press(p);
	int c;

	else if(m==1){
		c=press("A");
		
		if(c==1){
			a[0]='B';
			a[1]='X';
			a[2]='Y';
			p="A";
		}
		else{
			a[0]='A';
			a[1]='X';
			a[2]='Y';
			p="B";
		}

	}

	else if(m==0){
		c=press("X");

		if(c==1){
			a[0]='A';
			a[1]='B';
			a[2]='Y';
			p="X";
		}
		else{
			a[0]='A';
			a[1]='B';
			a[2]='X';
			p="Y";
		}
	}

	std::string S;
	int x=p.length();
	for(int i=x;i<N-1;i++){
		S=p;
		S+=a[0];
		S+=a[0];
		S+=p;
		S+=a[0];
		S+=a[1];
		S+=p;
		S+=a[0];
		S+=a[2];
		S+=p;
		S+=a[1];
		c=press(S);
		if(c==p.length()){
			p+=a[2];
		}
		else if(c==p.length()+1){
			p+=a[1];
		}
		else{
			p+=a[0];
		}
	}

	S=p;

	S+=a[0];

	c=press(S);

	if(c==p.length()+1)
		return S;

	else{
		S=p;
		S+=a[1];
		c=press(S);

		if(c==p.length()+1)
			return S;
		else{
			p+=a[2];
			return p;
		}
	}
}

int main(){
	int n;
	scanf("%d",&n);
	std::string s=guess_sequence(n);
	std::cout<<"ANS: "<<s;
	return 0;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:19:2: error: 'else' without a previous 'if'
   19 |  else if(m==1){
      |  ^~~~
combo.cpp:69:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |   if(c==p.length()){
      |      ~^~~~~~~~~~~~
combo.cpp:72:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |   else if(c==p.length()+1){
      |           ~^~~~~~~~~~~~~~
combo.cpp:86:6: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |  if(c==p.length()+1)
      |     ~^~~~~~~~~~~~~~
combo.cpp:94:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |   if(c==p.length()+1)
      |      ~^~~~~~~~~~~~~~
combo.cpp: In function 'int main()':
combo.cpp:105:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~