Submission #16966

#	Time	Username	Problem	Language	Result	Execution time	Memory
16966		gs14004	Highway design (CEOI12_highway)	C++14	49 / 100	23 ms	6316 KiB

highway

#include "office.h"
#include <set>
#include <vector>
using namespace std;

int main() {
	int n = GetN();
	int p1, p2, p3;
	for(int i=1; i<=3; i++){
		for(int j=i+1; j<=4; j++){
			for(int k=j+1; k<=5; k++){
				if(isOnLine(i, j, k)){ 
					p1 = i, p2 = j, p3 = k;
					break;
				}
			}
		}
	} // 10
	vector<int> ret;
	set<int> s;
	for(int i=1; i<=n; i++){
		if(i != p1 && i != p2 && i != p3) s.insert(i);
	}
	auto it1 = s.begin();
	auto it2 = ++s.begin();
	int found = 0;
	while(it2 != s.end()){
		if(!isOnLine(p1, *it1, *it2)){
			ret.push_back(*it1);
			ret.push_back(*it2);
			found++;
			if(ret.size() >= 4) break; 
		}
		it1++;
		it1++;
		it2++;
		if(it2 != s.end()) it2++;
	}
	if(it1 != s.end() && found < 2){
		ret.push_back(*it1);
	}
	int q1 = -1, q2 = -1;
	for(auto &i : ret){
		if(!isOnLine(p1, p2, i)){
			if(q1 == -1) q1 = i;
			else if(q2 == -1){
				q2 = i;
				break;
			}
		}
	}
	Answer(p1, p2, q1, q2);
}

Compilation message (stderr)

highway.cpp: In function 'int main()':
highway.cpp:22:25: warning: 'p3' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(i != p1 && i != p2 && i != p3) s.insert(i);
                         ^
highway.cpp:22:19: warning: 'p2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(i != p1 && i != p2 && i != p3) s.insert(i);
                   ^
highway.cpp:44:15: warning: 'p1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(!isOnLine(p1, p2, i)){
               ^
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:33:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &_N);
                     ^

• Subtask 1: 49 / 100