Submission #310808

#	Time	Username	Problem	Language	Result	Execution time	Memory
310808		EJam	Combo (IOI18_combo)	C++14	5 / 100	1 ms	200 KiB

combo

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

const string buttons = "ABXY";
char solveNext(string a){
	string nxtOp;
	for (auto c: buttons){
		if (c != a[0]){
			nxtOp.push_back(c);
		}
	}
	string p = a + nxtOp[0] + nxtOp[0] + a + nxtOp[0] + nxtOp[1] + a + nxtOp[0] + nxtOp[2] + a + nxtOp[1];
	// cout<<p<<endl;
	int res = press(p);
	if (res == a.length() + 1){
		return nxtOp[1];
	}
	if (res == a.length() + 2){
		return nxtOp[0];
	}
	if (res == a.length()){
		return nxtOp[2];
	}
	return 'z';
}

std::string guess_sequence(int N) {
	string ans;
	char ans1;
	for (auto it: buttons){
		if (press(string(1, it)) == 1){
			ans.push_back(it);
			break;
		}
	}
	for (int i = 1; i < N-1; i++){
		ans.push_back(solveNext(ans));
	}
	for (auto it: buttons){
		if (it != ans[0] && press(ans + it) == N){
			return ans + it;
		}
	}
	cout<<"foo"<<endl;
	return ans;
}
	

Compilation message (stderr)

combo.cpp: In function 'char solveNext(std::string)':
combo.cpp:16:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |  if (res == a.length() + 1){
      |      ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:19:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |  if (res == a.length() + 2){
      |      ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:22:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  if (res == a.length()){
      |      ~~~~^~~~~~~~~~~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:30:7: warning: unused variable 'ans1' [-Wunused-variable]
   30 |  char ans1;
      |       ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95