Submission #994631

#	Time	Username	Problem	Language	Result	Execution time	Memory
994631		salmon	Portal (BOI24_portal)	C++14	55 / 100	2054 ms	2512 KiB

Main

#include <bits/stdc++.h>
using namespace std;
 
int N;
long long int x,y;
long long int b,d;
long long int b1,d1;
long long int h1,h2;
bool flag = true;
bool floog = true;
vector<pair<long long int,long long int>> v;
 
int main(){
	
	long long int num = 0;
	long long int fum = 0;
	
	scanf(" %d",&N);
	
	scanf(" %lld",&x);
	scanf(" %lld",&y);
	
	for(int i = 0; i < N - 1; i++){
		scanf(" %lld",&h1);
		scanf(" %lld",&h2);
		
		h1 -= x;
		h2 -= y;
		
		if(h1 == 0 && h2 == 0) continue;
		
		flag &= (h1==0);
		floog &= (h2==0);
		
		if(h1!=0){
			b = h1;
			d = h2;
			
			
			d *= (b)/abs(b);
			b = abs(b);
		}
		if(h2!=0){
			b1 = h1;
			d1 = h2;
			
			
			b1 *= (d1)/abs(d1);
			d1 = abs(d1);
		}
		v.push_back({h1,h2});
	}
	
	if(flag || floog){
		printf("%d",-1);
		return 0;
	}
 
	for(pair<long long int,long long int> ii : v){
		h1 = ii.first;
		h2 = ii.second;
		
		for(pair<long long int, long long int> ii : v){
			if(ii.first == 0) continue;
			b = ii.first;
			d = ii.second;
			
		if(h1 != 0){
			
			h2 *= (h1)/abs(h1);
			h1 = abs(h1);
			
			long long int c = __gcd(h1,b);
			
			num = __gcd(num, h2 * b / c - d * h1 / c );
		}
		else{
			num = __gcd(num, h2);
		}
	}
		
		fum = __gcd(fum, h1);
	}
	//printf("%lld\n",num);
	if(fum == 0 || num == 0) printf("%d",-1);
	else{
		printf("%lld",abs(num * fum));
	}
	
	
}
/*
5
0 0
3 4
1 3
 */

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |  scanf(" %d",&N);
      |  ~~~~~^~~~~~~~~~
Main.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |  scanf(" %lld",&x);
      |  ~~~~~^~~~~~~~~~~~
Main.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |  scanf(" %lld",&y);
      |  ~~~~~^~~~~~~~~~~~
Main.cpp:24:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   scanf(" %lld",&h1);
      |   ~~~~~^~~~~~~~~~~~~
Main.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   scanf(" %lld",&h2);
      |   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 29 / 29
• Subtask 5: 15 / 15
• Subtask 6: 0 / 35