Submission #96675

#	Time	Username	Problem	Language	Result	Execution time	Memory
96675		shoemakerjo	Highway design (CEOI12_highway)	C++14	100 / 100	8 ms	1400 KiB

highway

#include "office.h"
#include <bits/stdc++.h>

using namespace std;

int n;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	vector<int> c1, c2, poss; //start all empty
	vector<int> c2poss; //extra stuff

	int tp = 0;
	n = GetN();

	if (isOnLine(1, 2, 3)) {
		tp = 0;
		c1.push_back(1);
		c1.push_back(2);
		c1.push_back(3);
		for (int i = 4; i <= n; i++) {
			poss.push_back(i);
		}
	}
	else if (isOnLine(1, 3, 4)) {
		tp = 1;
		c1.push_back(1);
		c1.push_back(3);
		c1.push_back(4);
		c2.push_back(2);
		for (int i = 5; i <= n; i++) {
			poss.push_back(i);
		}
	}
	else if (isOnLine(1, 2, 4)) {
		tp = 2;
		c1.push_back(1);
		c1.push_back(2);
		c1.push_back(4);
		c2.push_back(3);
		for (int i = 5; i <= n; i++) {
			poss.push_back(i);
		}
	}
	else if (isOnLine(2, 3, 4)) {
		tp = 3;
		c1.push_back(2);
		c1.push_back(3);
		c1.push_back(4);
		c2.push_back(1);
		for (int i = 5; i <= n; i++) {
			poss.push_back(i);
		}
	}
	else {
		//just bash
		if (isOnLine(1, 2, 5)) {
			Answer(1, 2, 3, 4);
			return 0;
		}
		if (isOnLine(1, 3, 5)) {
			Answer(1, 3, 2, 4);
			return 0;
		}
		if (isOnLine(1, 4, 5)) {
			Answer(1, 4, 2, 3);
			return 0;
		}
		if (isOnLine(2, 3, 5)) {
			Answer(2, 3, 1, 4);
			return 0;
		}
		if (isOnLine(2, 4, 5)) {
			Answer(2, 4, 1, 3);
			return 0;
		}
		if (isOnLine(3, 4, 5)) {
			Answer(3, 4, 1, 2);
			return 0;
		}
		return 0; //assert flase should also work here
	}

	while (poss.size()) {
		if (c2.size() >= 2) {
			//we can go ahead and answer
			Answer(c1[0], c1[1], c2[0], c2[1]);
			return 0;
		}
		if (poss.size() == 1) {
			//always must be in the answer
			Answer(c1[0], c1[1], c2[0], poss.back());
			return 0;
		}
			
		int a = poss.back(); poss.pop_back();
		int b = poss.back(); poss.pop_back();

		if (tp != 0 && poss.size() <= 1) {
			//at least one is in the answer
			if (isOnLine(c1[0], c1[1], a)) {
				c2.push_back(a);
			}
			else {
				c2.push_back(b);
			}
			continue;
		}
		if (isOnLine(c1[0], a, b)) {
			continue;
		}
		if (isOnLine(c1[0], c1[1], a)) {
			c2.push_back(b);
		}
		else {
			c2.push_back(a);
			c2poss.push_back(b);
		}
	}
	for (int v : c2poss) c2.push_back(v);

	Answer(c1[0], c1[1], c2[0], c2[1]);

}

Compilation message (stderr)

office.c: In function 'int isOnLine(int, int, int)':
office.c:85:29: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(0, "Protocol error");
                             ^
office.c:88:29: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(0, "Protocol error");
                             ^
office.c:92:37: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(false, "Too many questions");
                                     ^
office.c:83:7: warning: unused variable 'i' [-Wunused-variable]
   int i;
       ^
office.c: In function 'void Answer(int, int, int, int)':
office.c:123:29: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(0, "Protocol error");
                             ^
office.c:128:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
       if( (-_Apa[na1]==_N-3) && (na2!=na1) && (nb2!=na1) ||
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:130:30: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(true, "Correct");
                              ^
office.c:132:36: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(false, "Wrong answer");
                                    ^
office.c:134:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
       if( (-_Apa[na2]==_N-3) && (na1!=na2) && (nb1!=na2) ||
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:136:30: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(true, "Correct");
                              ^
office.c:138:36: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(false, "Wrong answer");
                                    ^
office.c:140:33: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
       _Fin(false, "Wrong answer");
                                 ^
office.c:142:23: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   _Fin(true, "Correct");
                       ^
office.c:120:27: warning: unused variable 'pont' [-Wunused-variable]
   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]
     scanf("%d", &_N);
     ~~~~~^~~~~~~~~~~

• Subtask 1: 100 / 100