Submission #30678

#	Time	Username	Problem	Language	Result	Execution time	Memory
30678		noobprogrammer	Park (BOI16_park)	C++14	100 / 100	1299 ms	3248 KiB

park

#include <bits/stdc++.h>
using namespace std ;
typedef long long ll ;
#define ii pair<ll,ll>
#define fi first
#define se second
#define vi vector<int>
#define vii vector<ii>
inline ll sqr(ll x) { return (ll)x*(ll)x ;} 

// define 0 = up , 1 = dw , 2 = lft , 3 = right 
int n , m , par[2010] , qr[100005] ;
ll w , h ;
ll sz[100005] , lim[10][10] ;
ll rd[2005] ;
ii coor[2005] ;

int find_root(int x){
	if(par[x] == x) return x ;
	return par[x] = find_root(par[x]) ;
}

ll dist(ii a , ii b){
	return sqr(a.fi - b.fi) + sqr(a.se - b.se) ;
}

bool chk(int x , int y , ll k ){
	// printf("%d %d %lld :: \n" , x , y , k ) ;
	for(int i=0;i<n+4;i++) par[i] = i ; 
	for(int i=0;i<n;i++){
		int pr = find_root(i) ;
		if(coor[i].se - rd[i] - 2*k < 0) if(find_root(n) != pr) par[find_root(n)]  = pr ;
		if(coor[i].se + rd[i] + 2*k > h) if(find_root(n + 1) != pr) par[find_root(n+1)] = pr ;  
		if(coor[i].fi - rd[i] - 2*k < 0) if(find_root(n + 2) != pr) par[find_root(n+2)] = pr ;  
		if(coor[i].fi + rd[i] + 2*k > w) if(find_root(n + 3) != pr) par[find_root(n+3)] = pr ;  
		for(int j=i+1;j<n;j++){
			if(dist(coor[i] , coor[j]) < sqr(rd[i] + rd[j] + 2*k) ) {
				if(find_root(j) != pr) par[find_root(j)] = pr ; 
				// printf("1 %d %d %lld %lld\n" , i , j , dist(coor[i] , coor[j]) , sqr(rd[i] + rd[j] + 2*k)) ;
			}
		}
	}
	int p0 = find_root(n) , p1 = find_root(n+1) , p2 = find_root(n+2) , p3 = find_root(n+3) ;
	// printf("%d %d %d %d : %d %d %lld\n", p0 , p1 , p2 , p3 , x  ,y ,k );
	if(x == y) return 1 ;
	if(y == 1){
		if(p0 == p2) return 0 ;
		if(x == 3 && ( p0 == p1 || p2 == p3 ) ) return 0 ;
		if(x == 2 && (p0 == p1) ) return 0 ;
		if(x == 4 && (p2 == p3) ) return 0; 
	}
	else if(y == 2){
		if(p0 == p3) return 0 ;
		if(x == 4 && ( p0 == p1 || p2 == p3 ) ) return 0 ;
		if(x == 1 && (p0 == p1) ) return 0 ;
		if(x == 3 && (p2 == p3) ) return 0; 
	}	
	else if(y == 3){
		if(p1 == p3) return 0 ;
		if(x == 1 && ( p0 == p1 || p2 == p3 ) ) return 0 ;
		if(x == 4 && (p0 == p1) ) return 0 ;
		if(x == 2 && (p2 == p3) ) return 0; 
	}
	else{
		if(p1 == p2) return 0 ;
		if(x == 2 && ( p0 == p1 || p2 == p3 ) ) return 0 ;
		if(x == 3 && ( p0 == p1 ) ) return 0 ;
		if(x == 1 && ( p2 == p3 ) ) return 0; 
	}
	if(x == 1 && (p0 == p2)) return 0 ;
	if(x == 2 && (p0 == p3)) return 0 ;
	if(x == 3 && (p1 == p3)) return 0 ;
	if(x == 4 && (p1 == p2)) return 0 ;
	return 1 ;
}

int main(){
	// freopen("in.txt" , "r" ,stdin) ;
	// freopen("out.txt" , "w" , stdout ) ;
	scanf("%d%d%lld%lld" , &n,&m,&w,&h) ;
	int a , b , c ; 
	for(int i=0;i<n;i++) {
		scanf("%d%d%d",&a,&b,&c) ;
		coor[i] = {a,b} ;
		rd[i] = c ; 
	}
	ll mx = 0 ;
	for(int i=0;i<m;i++){
		scanf("%d%d",&a,&b) ;
		qr[i] = b ; 
		sz[i] = a ; 
		mx = max(mx , (ll)a) ; 
	}
	ll f , l , mid ;
	for(int i=1;i<=4;i++){
		lim[i][i] = mx ; 
		for(int j=i+1;j<=4;j++){
			f = 0 , l = mx ;
			while(f <= l){
				mid = (f+l)/2 ;
				if(chk(i,j,mid)){
					lim[i][j] = mid ;
					f = mid + 1 ;
				}
				else l = mid - 1 ;
			}
			lim[j][i] = lim[i][j] ;
		}
	}
	for(int i=0;i<m;i++){
		b = qr[i] ; 
		for(int j=1;j<=4;j++){
			if(lim[b][j] >= sz[i]) printf("%d",j) ;
		}
		printf("\n");
	}
}

Compilation message (stderr)

park.cpp: In function 'int main()':
park.cpp:80:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%lld%lld" , &n,&m,&w,&h) ;
                                      ^
park.cpp:83:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d",&a,&b,&c) ;
                            ^
park.cpp:89:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&a,&b) ;
                       ^

• Subtask 1: 27 / 27
• Subtask 2: 31 / 31
• Subtask 3: 42 / 42