Submission #677364

#	Time	Username	Problem	Language	Result	Execution time	Memory
677364		hello_there_123	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
	//#include "combo.h"
	using namespace std;
	string arr[4]={"A","B","X","Y"};
	set<string>st;
	int press(string s);
	string guess_sequence(int N){
      	if(N==1){
			assert(1==0);
        }
		string ans = "";
		string start = "";
		st.insert("A");
		st.insert("B");
		st.insert("X");
		st.insert("Y");
		for(int i=0;i<3;i++){
			string tr = "";
			for(int j=0;j<3;j++){
				else tr = tr+arr[i] + arr[j];
			}
			if(press(tr) == 2){
				start = arr[i];
				break;
			}
		}
		if(start == "") start = "Y";
		st.erase(start);
		vector<string>v;
		for(auto string:st) v.push_back(string);
		ans+=start;
		assert(ans.length() == 1);
		for(int i=0;i<N-2;i++){
			string tr = "";
			tr+=ans;
			tr+=v[0];
			tr+=ans;
			tr+=v[1];
			tr+=v[0];
			tr+=ans;
			tr+=v[1];
			tr+=v[1];
			tr+=ans;
			tr+=v[1];
			tr+=v[2];
			if(press(tr) == ans.length()){
				ans+=v[2];
			}
			else if(press(tr) == ans.length()+1){
				ans+=v[0];
			}
			else ans+=v[1];
			
		}
		if(press(ans+v[0]) == N) return ans+v[0];
		if(press(ans+v[1]) == N) return ans+v[1];
		if(press(ans+v[2])==N) return ans+v[2];
		assert(1);
	 
	}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:20:5: error: 'else' without a previous 'if'
   20 |     else tr = tr+arr[i] + arr[j];
      |     ^~~~
combo.cpp:46:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |    if(press(tr) == ans.length()){
      |       ~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:49:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |    else if(press(tr) == ans.length()+1){
      |            ~~~~~~~~~~^~~~~~~~~~~~~~~~~
combo.cpp:11:16: warning: control reaches end of non-void function [-Wreturn-type]
   11 |   string ans = "";
      |                ^~