Submission #776273

#	Time	Username	Problem	Language	Result	Execution time	Memory
776273		NK_	Highway design (CEOI12_highway)	C++17	100 / 100	2 ms	1364 KiB

highway

// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>
#include "office.h"

using namespace std;

#define nl '\n'

// g++ -std=c++17 office.cpp A.cpp

int main() {
	cin.tie(0)->sync_with_stdio(0);
	
	int N = GetN();

	if (isOnLine(1, 2, 3)) {
		vector<int> I; for(int i = 3; i < N; i++) I.push_back(i);

		int a1 = 1, b1 = 2;
		int a2 = -1, b2 = -1;
		for(int i = 0; i < int(size(I)); i += 2) {
			int a = I[i], b = I[i+1];
			if (!isOnLine(a1, a + 1, b + 1)) {
				if (isOnLine(a1, b1, a)) {
					if (a2 == -1) a2 = b;
					else b2 = b;
				} else {
					if (a2 == -1) a2 = a;
					else b2 = a;
				}
				if (a2 != -1 && b2 != -1) break;
			}
		}	

		if (b2 == -1) {
			assert(size(I) % 2);
			b2 = I.back();
		}

		Answer(a1, b1, a2, b2);
	} else if (isOnLine(1, 4, 5)) {
		vector<int> I; for(int i = 1; i < N; i++) if (i != 3 && i != 4) I.push_back(i);

		int a1 = 1, b1 = 4;
		int a2 = -1, b2 = -1;
		for(int i = 0; i < int(size(I)); i += 2) {
			int a = I[i], b = I[i+1];
			if (a == 1 || !isOnLine(a1, a + 1, b + 1)) {
				if (isOnLine(a1, b1, a)) {
					if (a2 == -1) a2 = b;
					else b2 = b;
				} else {
					if (a2 == -1) a2 = a;
					else b2 = a;
				}
				if (a2 != -1 && b2 != -1) break;
			}
		}	

		if (b2 == -1) {
			assert(size(I) % 2);
			b2 = I.back();
		}

		Answer(a1, b1, a2, b2);
	} else if (isOnLine(2, 4, 5)) {
		int a1 = 2, b1 = 4;
		int a2 = 1, b2 = -1;

		vector<int> I; for(int i = 5; i < N; i++) I.push_back(i);
		for(int i = 0; i < int(size(I)); i += 2) {
			int a = I[i], b = I[i+1];
			if (!isOnLine(a1, a + 1, b + 1)) {
				if (isOnLine(a1, b1, a)) {
					if (a2 == -1) a2 = b;
					else b2 = b;
				} else {
					if (a2 == -1) a2 = a;
					else b2 = a;
				}
				if (a2 != -1 && b2 != -1) break;
			}
		}	

		if (b2 == -1) {
			assert(size(I) % 2);
			b2 = I.back();
		}

		Answer(a1, b1, a2, b2);
	} else {
		int a1, b1, a2, b2;
		set<int> S = {0, 1, 2, 3, 4};
		for(int i = 0; i < 5; i++) {
			for(int j = i+1; j < 5; j++) {
				for(int k = j+1; k < 5; k++) {
					if (isOnLine(i + 1, j + 1, k + 1)) {
						a1 = i + 1, b1 = j + 1;
						S.erase(i); S.erase(j); S.erase(k);
						a2 = *begin(S) + 1, b2 = *rbegin(S) + 1;
					}
				}
			}
		} 

		Answer(a1, b1, a2, b2);
	}


    return 0;
}


	

Compilation message (stderr)

highway.cpp: In function 'int main()':
highway.cpp:106:9: warning: 'b2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  106 |   Answer(a1, b1, a2, b2);
      |   ~~~~~~^~~~~~~~~~~~~~~~
highway.cpp:106:9: warning: 'a2' may be used uninitialized in this function [-Wmaybe-uninitialized]
highway.cpp:106:9: warning: 'b1' may be used uninitialized in this function [-Wmaybe-uninitialized]
highway.cpp:106:9: warning: 'a1' may be used uninitialized in this function [-Wmaybe-uninitialized]
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