Submission #146075

#	Time	Username	Problem	Language	Result	Execution time	Memory
146075		Mamnoon_Siam	Highway design (CEOI12_highway)	C++17	100 / 100	5 ms	760 KiB

highway

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

int main(int argc, char const *argv[])
{
	int N = GetN();

	if(isOnLine(1, 2, 3)) {
		int found = 0;
		vector<int> tmp;
		for(int j = 5; j <= N - 2 + found; j += 2) {
			int i = j - 1;
			if(!isOnLine(1, i, j)) {
				int x = isOnLine(1, 2, i);
				int y = isOnLine(1, 2, j);
				if(!x) {
					tmp.emplace_back(i);
					found++;
					if(found == 2) break;
				}
				if(!y) {
					tmp.emplace_back(j);
					found++;
					if(found == 2) break;
				}
			}
		}
		for(int i = 0; i < (2 - found); i++) {
			tmp.emplace_back(N - i);
		}
		Answer(1, 2, tmp[0], tmp[1]);
		return 0;
	}
	int flag = 0;
	int a, b;
	for(int i = 1; i <= 3; i++) {
		for(int j = i + 1; j <= 3; j++) {
			if(isOnLine(i, j, 4)) {
				a = i, b = j;
				flag = 1;
				break;
			}
		}
		if(flag) {
			break;
		}
	}
	if(flag) {
		vector<int> tmp;
		int found = 1;
		tmp.emplace_back(1 ^ 2 ^ 3 ^ a ^ b);
		for(int j = 6; j <= N - 2 + found; j += 2) {
			int i = j - 1;
			if(!isOnLine(a, i, j)) {
				int x = isOnLine(a, b, i);
				int y = isOnLine(a, b, j);
				if(!x) {
					tmp.emplace_back(i);
					found++;
					if(found == 2) break;
				}
				if(!y) {
					tmp.emplace_back(j);
					found++;
					if(found == 2) break;
				}
			}
		}
		for(int i = 0; i < (2 - found); i++) {
			tmp.emplace_back(N - i);
		}
		Answer(a, b, tmp[0], tmp[1]);
	} else {
		for(int i = 1; i <= 4; i++) {
			for(int j = i + 1; j <= 4; j++) {
				if(isOnLine(i, j, 5)) {
					a = i, b = j;
					flag = 1;
					break;
				}
			}
			if(flag) {
				break;
			}
		}
		vector<int> book(5);
		book[a] = 1, book[b] = 1;
		vector<int> tmp;
		for(int i = 1; i <= 4; i++) {
			if(!book[i]) tmp.emplace_back(i);
		}
		Answer(a, b, tmp[0], tmp[1]);
	}
	return 0;
}

Compilation message (stderr)

highway.cpp: In function 'int main(int, const char**)':
highway.cpp:93:9: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   Answer(a, b, tmp[0], tmp[1]);
   ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
highway.cpp:93:9: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
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