Submission #547079

#	Time	Username	Problem	Language	Result	Execution time	Memory
547079		blue	Highway design (CEOI12_highway)	C++17	100 / 100	1 ms	592 KiB

highway

#include <iostream>
#include <vector>
#include "office.h"
using namespace std;
 
using vi = vector<int>;
#define sz(x) int(x.size())
 
int main()
{
	int N = GetN();
 
	int Q123 = isOnLine(1, 2, 3);
	int Q341 = isOnLine(3, 4, 1);
 
	vi biglist, smalllist;
 
	if(Q123 && Q341) //elements are homogenous (4, 0)
	{
		vi goodlist;
		for(int i = 5; i+1 <= N; i += 2)
		{
			if(!isOnLine(1, i, i+1))
			{
				goodlist.push_back(i);
			}
		}

		if(sz(goodlist) >= 2)
		{
			int e1 = isOnLine(1, 2, goodlist[0]) ? goodlist[0] + 1 : goodlist[0];
			int e2 = isOnLine(1, 2, goodlist[1]) ? goodlist[1] + 1 : goodlist[1];
			Answer(1, 2, e1, e2);
		}
		else
		{
			if(N % 2 == 0)
				Answer(1, 2, goodlist[0], goodlist[0] + 1);
			else
			{
				vi lst{1, 2};
				
				int agood = !isOnLine(lst[0], lst[1], goodlist[0]);
				int bgood = !isOnLine(lst[0], lst[1], goodlist[0] + 1);
 
				if(agood && bgood) Answer(lst[0], lst[1], goodlist[0], goodlist[0] + 1);
				else if(agood) Answer(lst[0], lst[1], goodlist[0], N);
				else Answer(lst[0], lst[1], goodlist[0] + 1, N);
			}
		}
	}
	else
	{
		int Q234 = isOnLine(2, 3, 4);
		int Q412 = isOnLine(4, 1, 2);
 
		int tot = Q234 + Q412 + Q123 + Q341;
 
		if(tot == 0) //(2, 2)
		{
			if(isOnLine(5, 1, 2)) Answer(1, 2, 3, 4);
			else if(isOnLine(5, 2, 3)) Answer(1, 4, 2, 3);
			else Answer(1, 3, 2, 4);
 
			return 0;
		}
 
		int exc = 0;
		if(Q123) exc = 4;
		else if(Q341) exc = 2;
		else if(Q234) exc = 1;
		else exc = 3;
 
		vi lst;
		for(int i = 1; i <= 4; i++)
			if(i != exc)
				lst.push_back(i);
 
		vi goodlist;
		for(int i = 5; i+1 <= N; i += 2)
		{
			if(!isOnLine(lst[0], lst[1], i))
				goodlist.push_back(i);
		}
 
		if(sz(goodlist) >= 2)
		{
			int e1 = isOnLine(lst[0], lst[1], goodlist[0]) ? goodlist[0] + 1 : goodlist[0];
			int e2 = isOnLine(lst[0], lst[1], goodlist[1]) ? goodlist[1] + 1 : goodlist[1];
			Answer(lst[0], lst[1], e1, e2);
			return 0;
		}
		else
		{
			int agood = !isOnLine(lst[0], lst[1], goodlist[0]);
			int bgood = !isOnLine(lst[0], lst[1], goodlist[0] + 1);
 
			if(agood && bgood) Answer(lst[0], lst[1], goodlist[0], goodlist[0] + 1);
			else if(agood) Answer(lst[0], lst[1], goodlist[0], N);
			else Answer(lst[0], lst[1], goodlist[0] + 1, N);
		}
	}
}

Compilation message (stderr)

office.c: In function 'int isOnLine(int, int, int)':
office.c:85:13: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   85 |     _Fin(0, "Protocol error");
      |             ^~~~~~~~~~~~~~~~
office.c:88:13: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   88 |     _Fin(0, "Protocol error");
      |             ^~~~~~~~~~~~~~~~
office.c:92:17: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   92 |     _Fin(false, "Too many questions");
      |                 ^~~~~~~~~~~~~~~~~~~~
office.c:83:7: warning: unused variable 'i' [-Wunused-variable]
   83 |   int i;
      |       ^
office.c: In function 'void Answer(int, int, int, int)':
office.c:123:13: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  123 |     _Fin(0, "Protocol error");
      |             ^~~~~~~~~~~~~~~~
office.c:128:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  128 |       if( (-_Apa[na1]==_N-3) && (na2!=na1) && (nb2!=na1) ||
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:130:21: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  130 |          _Fin(true, "Correct");
      |                     ^~~~~~~~~
office.c:132:22: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  132 |          _Fin(false, "Wrong answer");
      |                      ^~~~~~~~~~~~~~
office.c:134:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  134 |       if( (-_Apa[na2]==_N-3) && (na1!=na2) && (nb1!=na2) ||
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:136:21: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  136 |          _Fin(true, "Correct");
      |                     ^~~~~~~~~
office.c:138:22: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  138 |          _Fin(false, "Wrong answer");
      |                      ^~~~~~~~~~~~~~
office.c:140:19: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  140 |       _Fin(false, "Wrong answer");
      |                   ^~~~~~~~~~~~~~
office.c:142:14: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  142 |   _Fin(true, "Correct");
      |              ^~~~~~~~~
office.c:120:27: warning: unused variable 'pont' [-Wunused-variable]
  120 |   int na1, nb1, na2, nb2, pont;
      |                           ^~~~
office.c: In function 'void _doInit()':
office.c:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%d", &_N);
      |     ~~~~~^~~~~~~~~~~

• Subtask 1: 100 / 100