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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#618113 | #9434. Italian Cuisine | Emotion_Z | WA | 38ms | 7864kb | C++17 | 4.6kb | 2024-10-06 18:53:20 | 2024-10-06 18:53:22 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define int __int128
#define deg( x ) cout<<""#x"="<<x<<endl
#define endl '\n'
const int N=1e5+10;
int abss( __int128 x ){
if( x<0 ) x=-x;
return x;
}
istream &operator>>( istream &in , __int128 &n ){
string s; in>>s;
n=0;
int f=1;
int st=0;
if( s[ 0 ]=='-' ) f=-1 , st=1;
for( int i=st; i<s.size(); i++ ) n=n*10+s[ i ]-'0';
n*=f;
return in;
}
ostream &operator<<( ostream &out , __int128 n ){
if( n==0 ){
out<<0;
return out;
}
string s;
bool ok=false;
if( n<0 ) ok=true , n=-n;
while( n ){
s+='0'+n%10;
n/=10;
}
if( ok ) s+='-';
reverse( s.begin( ) , s.end( ) );
out<<s;
return out;
}
int sta[ N ]; //数组模拟栈用来存凸包点集,第一个是1号点最后一个也是1号点;
int k=0; //栈的size;
struct node //结构体存点坐标;
{
int x,y;
friend bool operator<( const node& a , const node& b )//自定义排序;
{
if( a.x!=b.x ) return a.x<b.x;
return a.y<b.y;
}
} A[ N ];
node B[ N ];
int Cross( node a , node b , node c )//垂直向量法求相对方向;大于0在左,小于0在右,等于0共线;
{
int te1x=a.y-b.y,te1y=b.x-a.x;
int te2x=c.x-b.x,te2y=c.y-b.y;
return te1x*te2x+te1y*te2y;
}
void andrew( int n )//n为总点数;
{
k=0;
sort( A+1 , A+1+n );//排序;
for( int i=1; i<=n; i++ ){ //求下凸包;
while( k>1 && Cross( A[ sta[ k-1 ] ] , A[ sta[ k ] ] , A[ i ] )<=0 ) k--;
k++;sta[ k ]=i;
}
int te=k;
for( int i=n-1; i>=1; i-- ){ //求上凸包;
while( k>te && Cross( A[ sta[ k-1 ] ] , A[ sta[ k ] ] , A[ i ] )<=0 ) k--;
k++;sta[ k ]=i;
}
}
int cross( node a , node b , node c ){
return ( b.x-a.x )*( c.y-a.y )-( b.y-a.y )*( c.x-a.x );
}
bool pan( int sx , int sy , int r , node a , node b ){
if( cross( a , b , { sx , sy } ) <= 0 ) return false;
int a1=( b.y-a.y ) , b1=( a.x-b.x ) , c1=( b.x*a.y-a.x*b.y );
// int g=__gcd( a1 , __gcd( b1 , c1 ) );
// a1/=g , b1/=g , c1/=g;
int d=abss( a1*sx + b1*sy + c1 );
d*=d;
int di=( a1*a1+b1*b1 );
// int g=__gcd( di , d );
// d/=g , di/=g;
r*=r;
r*=di;
if( d>=r ) return true;
return false;
}
void solve(){
int n;
cin>>n;
int sx,sy,r;
cin>>sx>>sy>>r;
for( int i=1; i<=n; i++ ){
cin>>A[ i ].x>>A[ i ].y;
}
andrew( n );
n=k-1;
for( int i=1; i<=n; i++ ){
B[ i ]=A[ sta[ i ] ];
}
for( int i=1; i<=n; i++ ){
A[ i ]=B[ i ];
}
// if( A[ 1 ].x==1978788055 ){
// cout<<0<<endl;
// return;
// }
cout<<"";
// int idx=0;
// A[ ++idx ]=B[ 1 ];
// A[ ++idx ]=B[ 2 ];
// for( int i=3; i<=n; i++ ){
// if( cross( A[ idx-1 ] , A[ idx ] , B[ i ] )==(__int128)0 ) idx--;
// A[ ++idx ]=B[ i ];
// }
//
// //deg( idx );
// for( int i=1; i<=idx; i++ ){
// cout<<A[ i ].x<<" "<<A[ i ].y<<endl;
// }
//
// if( cross( A[ idx ] , A[ 1 ] , A[ 2 ] )==0 ){
//
// cout<<"gg"<<endl;
// for( int i=1; i<idx; i++ ){
// A[ i ]=A[ i+1 ];
// }
// idx--;
// }
// n=idx;
// deg( cross( { 0,5 } , { 0,0 } , { 1,0 } ) );
// deg( n );
// cerr<<A[ 1 ].x<<" "<<A[ 1 ].y<<endl;
//if( pan( sx , sy , r , A[ 1 ] , A[ 2 ] ) ) cout<<"gg"<<endl;
int ans=0;
int ne=1;
int cnt=0;
for( int i=1; i<=n; i++ ){
if( ne==i ) ne=i+1;
if( ne==n+1 ) ne=1;
while( 1 ){
if( pan( sx , sy , r , A[ i ] , A[ ne ] ) ){
//cout<<i<<"->"<<ne<<endl;
int di=ne-1;
if( di==0 ) di=n;
//cout<<"+"<<i<<" "<<di<<" "<<ne<<endl;
//cout<<"++"<<cross( A[ i ] , A[ di ] , A[ ne ] )<<endl;
cnt+=abss( cross( A[ i ] , A[ di ] , A[ ne ] ) );
ne++;
if( ne==n+1 ) ne=1;
}
else{
ne--;
if( ne==0 ) ne=n;
break;
}
}
//cout<<"结束"<<i<<" "<<cnt<<endl;
ans=max( ans , cnt );
int tt=i+1; if( tt>n ) tt=1;
cnt-=abss( cross( A[ ne ] , A[ i ] , A[ tt ] ) );
ne++; if( ne==n+1 ) ne=1;
}
cout<<ans<<endl;
}
signed main() {
// ios::sync_with_stdio( 0 );
// cin.tie( 0 ); cout.tie( 0 );
int T=1;
cin>>T;
while( T-- ){
solve();
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 7860kb
input:
3 5 1 1 1 0 0 1 0 5 0 3 3 0 5 6 2 4 1 2 0 4 0 6 3 4 6 2 6 0 3 4 3 3 1 3 0 6 3 3 6 0 3
output:
5 24 0
result:
ok 3 number(s): "5 24 0"
Test #2:
score: 0
Accepted
time: 1ms
memory: 7864kb
input:
1 6 0 0 499999993 197878055 -535013568 696616963 -535013568 696616963 40162440 696616963 499999993 -499999993 499999993 -499999993 -535013568
output:
0
result:
ok 1 number(s): "0"
Test #3:
score: -100
Wrong Answer
time: 38ms
memory: 7700kb
input:
6666 19 -142 -128 26 -172 -74 -188 -86 -199 -157 -200 -172 -199 -186 -195 -200 -175 -197 -161 -188 -144 -177 -127 -162 -107 -144 -90 -126 -87 -116 -86 -104 -89 -97 -108 -86 -125 -80 -142 -74 -162 -72 16 -161 -161 17 -165 -190 -157 -196 -154 -197 -144 -200 -132 -200 -128 -191 -120 -172 -123 -163 -138...
output:
5093 3086 2539 668 3535 7421 4883 5711 5624 1034 2479 3920 4372 2044 4996 4569 2251 4382 4175 1489 1154 3231 4038 1631 5086 14444 1692 6066 687 1512 4849 5456 2675 8341 8557 8235 1013 5203 10853 6042 6300 4480 2303 2728 1739 2187 3385 4266 6322 909 4334 1518 948 5036 1449 2376 3180 4810 1443 1786 46...
result:
wrong answer 16th numbers differ - expected: '5070', found: '4569'