QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#112022 | #1182. Lighthouses | qinsanma | AC ✓ | 1122ms | 14832kb | C++14 | 2.4kb | 2023-06-09 15:01:51 | 2023-06-09 15:01:54 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
double x[1000],y[1000];
double dist(int a,int b)
{
return sqrt((x[a]-x[b])*(x[a]-x[b])+(y[a]-y[b])*(y[a]-y[b]));
}
bool a[1000][1000];
double dp[1000][1000][2];
int main()
{
int t;
cin>>t;
while(t--)
{
int n;
cin>>n;
for(int i=1; i<=n; i++)
{
cin>>x[i]>>y[i];
x[i+n]=x[i];
y[i+n]=y[i];
}
for(int i=1; i<=2*n; i++)
{
for(int j=1; j<=2*n; j++)
{
a[i][j]=0;
dp[i][j][0]=dp[i][j][1]=0;
}
}
int m;
cin>>m;
double ans=0;
for(int i=1; i<=m; i++)
{
int xx,yy;
cin>>xx>>yy;
a[xx][yy]=1;
a[yy][xx]=1;
a[xx+n][yy]=1;
a[yy][xx+n]=1;
a[xx][yy+n]=1;
a[yy+n][xx]=1;
a[xx+n][yy+n]=1;
a[yy+n][xx+n]=1;
dp[xx][yy][0]=dp[yy][xx][0]=dp[xx+n][yy][0]=dp[yy][xx+n][0]=dp[xx][yy+n][0]=dp[yy+n][xx][0]=dp[yy+n][xx+n][0]=dp[xx+n][yy+n][0]=dist(xx,yy);
dp[xx][yy][1]=dp[yy][xx][1]=dp[xx+n][yy][1]=dp[yy][xx+n][1]=dp[xx][yy+n][1]=dp[yy+n][xx][1]=dp[yy+n][xx+n][1]=dp[xx+n][yy+n][1]=dist(xx,yy);
ans=max(ans,dist(xx,yy));
}
for(int len=n; len>=2; len--)
{
for(int l=1; l+len-1<=2*n; l++)
{
int r=l+len-1;
for(int j=l+1; j<r; j++)
{
if(a[l][j])
{
dp[l][j][1]=max(dp[l][j][1],dp[l][r][0]+dist(l,j));
dp[j][r][0]=max(dp[j][r][0],dp[l][r][0]+dist(l,j));
ans=max(ans,dp[l][j][1]);
ans=max(ans,dp[j][r][0]);
}
if(a[r][j])
{
dp[j][r][0]=max(dp[j][r][0],dp[l][r][1]+dist(r,j));
dp[l][j][1]=max(dp[l][j][1],dp[l][r][1]+dist(r,j));
ans=max(ans,dp[l][j][1]);
ans=max(ans,dp[j][r][0]);
}
}
}
}
cout<<fixed<<setprecision(9)<<ans<<endl;
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 1ms
memory: 7724kb
input:
2 4 0 0 1 0 1 1 0 1 3 1 3 2 4 3 4 4 0 0 1 0 1 1 0 1 4 1 4 4 3 3 2 2 1
output:
2.414213562 3.000000000
result:
ok 2 numbers
Test #2:
score: 0
Accepted
time: 11ms
memory: 3668kb
input:
450 7 0 0 260338181 86092533 323066179 107441010 424697382 278447352 71444106 1000000000 -575302618 804979842 -258577414 97804732 20 2 3 2 5 1 3 7 4 2 1 5 3 6 2 7 5 4 2 3 6 1 7 5 6 4 6 4 5 3 4 7 2 6 1 1 5 7 6 4 1 5 0 0 713930457 800419774 94147955 958520832 -286069543 1000000000 -262432976 698118841...
output:
4765927085.197136879 3445280472.471964836 4807.744303066 3190.426973230 4345171440.261609077 6514.458110994 3773167316.242773056 2276985.135787843 1033.226499854 2035605.489658920 5547331390.472334862 0.000000000 2480.599962470 2348460308.029507637 7779.583217082 4517152358.373314857 1366112.7952040...
result:
ok 450 numbers
Test #3:
score: 0
Accepted
time: 1122ms
memory: 14832kb
input:
10 295 0 0 14682701 503060 25046284 1037424 36405162 1792084 39349419 2119133 68531516 5963501 88143287 8803232 105612921 11584151 110634846 12446595 115510397 13365788 123709362 15371938 138667321 19292100 143732922 20680197 152527267 23117317 161336760 25663342 175610584 29864225 179534317 3102751...
output:
138692526440.221313477 142741536635.014129639 210677906142.053436279 44669007984.586189270 143288343239.696929932 7617016839.570425034 49984226404.877372742 199989775093.763916016 206539582580.724273682 45567211025.837249756
result:
ok 10 numbers