Spoj/IMBOX.cpp at master · Jaskamalkainth/Spoj · GitHub

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/*
 *
 *    J1K7_7
 *
 */
#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <vector>
#include <deque>
#include <queue>
#include <stack>
#include <set>
#include <cstring>
#include <list>
#include <map>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <utility>
#include <bitset>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <limits>
using namespace std;
typedef long long          ll;
typedef unsigned long long ull;
typedef long double        ld;
typedef pair<int,int>      pii;
typedef pair<ll,ll>        pll;
typedef vector<int>        vi;
typedef vector<long long>  vll;
#define l(x) 		       (x << 1) + 1
#define r(x) 		       (x << 1) + 2
#define mid(l, r) 	       ((l + r) >> 1)
#define mp                 make_pair
#define pb                 push_back
#define all(a)             a.begin(),a.end()
#define pr(n)              printf("%d",n)
#define s(n)               scanf("%d",&n)
#define debug(x)	       {cerr <<#x<<" = " <<x<<"\n"; }
#define debug2(x, y)       {cerr <<#x<<" = " <<x<<", "<<#y <<" = " <<y <<"\n";}
#define ss                 second
#define ff                 first
#define m0(x) 		       memset(x,0,sizeof(x))
#define snuke(c,itr)       for(__typeof((c).begin()) itr=(c).begin();itr!=(c).end();itr++)
const int mod=1e9+7;

const ll  mx_ll   = numeric_limits<ll> :: max();
const int mx_int  = numeric_limits<int> :: max();

const long double PI = (long double)(3.1415926535897932384626433832795);

inline bool ispow2(int x){return (x!=0 && (x&(x-1))==0);} //0 or 1

int msb(unsigned x){ union { double a; int b[2]; }; a = x; return (b[1] >> 20) - 1023; }

template<class T>
inline void cinarr(T a, int n){ for (int i=0;i<n;++i) cin >> a[i];}

inline ll powmod(ll a,ll b) {ll res = 1; while(b){if(b&1) res = (res*a)%mod;a = (a*a)%mod;b >>= 1;}return res;}

inline ll gcd(ll a,ll b){ll t;while(b){a=a%b;t=a;a=b;b=t;}return a;}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}

inline int nextint(){ int x; scanf("%d",&x); return x; }
inline ll nextll(){ ll x; scanf("%lld",&x); return x; }

struct rectangle
{
	int x1,y1;
	int x2,y2;
	ll area()
	{
		return 1ll*(x2-x1)*(y2-y1);
	}

};
bool operator < (const rectangle &r1 , const rectangle &r2)
{
	if ( r1.x1 == r2.x1 )
		return r1.y1 < r2.y1;
	return r1.x1 < r2.x1;
}


int main()
{
	ios_base::sync_with_stdio(false); cin.tie(0);

	int n; cin >> n ;

	vector<rectangle> r;
	r.resize(n);
	for(int i = 0; i < n; i++)
	{
		cin >> r[i].x1 >> r[i].y1;
		cin >> r[i].x2 >> r[i].y2;

		if ( r[i].x1 > r[i].x2 )
		{
			swap ( r[i].x1 , r[i].x2);
			swap ( r[i].y1 , r[i].y2);
		}
	}
	sort(r.begin() , r.end() );

	ll cur_max_x =  numeric_limits<ll> :: min();
	ll cur_max_y =  numeric_limits<ll> :: min();

	ll ans = 0ll;

	for(int i = 0;  i < n ; i++)
	{
		if ( r[i].x1 < cur_max_x && r[i].y1 < cur_max_y ) {}
		else
		{
			ans += r[i].area();
		}
		// update the cur_max_x & cur_max_y
		if ( r[i].x2 > cur_max_x || ( r[i].x2 == cur_max_x  && r[i].y2 > cur_max_y  ) )
		{
			cur_max_x = r[i].x2;
			cur_max_y = r[i].y2;
		}
	}


	cout << ans << "\n";

    return 0;
}