| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 959380 |
2024-04-08T06:20:19 Z |
ALTAKEXE |
Fence (CEOI08_fence) |
C++17 |
|
1 ms |
500 KB |
#include <bits/stdc++.h>
#define ll long long
#define MAXN 110
using namespace std;
struct TT{
ll x,y;
};
ll n,m,dist[MAXN];
TT h[MAXN],t[MAXN],p0;
bool in[MAXN];
ll Cross(TT c,TT a,TT b){
return (a.x-c.x)*(b.y-c.y)-(a.y-c.y)*(b.x-c.x);
}
bool Cmp(TT a,TT b){
return Cross(p0,a,b)>0;
}
vector<TT> ch;
void Convex_Hull(){
ll ind=1;
for(ll i=2;i<=n;i++){ //ind = Rigth Bottom index
if(h[i].y<h[ind].y || (h[i].y==h[ind].y && h[i].x<h[ind].x))
ind=i;
}
swap(h[1],h[ind]); //h[1] change Right Bottom tree to index=1
p0=h[1];
sort(h+2,h+1+n,Cmp);//Order by Angle Ox axe
stack<TT> s;
s.push(h[1]);
s.push(h[2]);
s.push(h[3]);
for(ll i=4;i<=n;i++){
TT a=s.top(),b;
s.pop();
b=s.top();
s.push(a);
while(Cross(b,a,h[i])<0){
s.pop();
a=s.top();
s.pop();
b=s.top();
s.push(a);
}
s.push(h[i]);
}
while (!s.empty()){
ch.push_back(s.top());
s.pop();
}
reverse(ch.begin(),ch.end());
}
vector<ll> G[MAXN];
int main(){
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin>>n>>m;
for(ll i=1;i<=n;i++) cin>>h[i].x>>h[i].y; //Read holes h array
for(ll i=1;i<=m;i++) cin>>t[i].x>>t[i].y; //Read trees t array
Convex_Hull(); //create convex holl by h hole's array
for(ll i=0;i<ch.size() && ch.size()>2;){//Remove free hole from "Convex holl"
TT a=ch[i],b=ch[(i+1)%ch.size()],c=(!i)?ch[ch.size()-1]:ch[i-1];
bool ok=true;
for(ll j=1;j<=m;j++)
if(Cross(a,b,t[j])>0 && Cross(b,c,t[j])>0 && Cross(c,a,t[j])>0){
ok=false;
break;
}
if(ok)ch.erase(ch.begin()+i);
else i++;
}
ll ans=111*m,cnt=0;
if (ch.size()<3){
cout<<ans;
return 0;
}
for(ll i=1;i<=m;i++){ //cnt=count tree in Convex holl
in[i]=true;
for(ll j=0;j<ch.size();j++){
TT a=ch[j],b=t[i],c=(!j)?ch[ch.size()-1]:ch[j-1];
in[i]=(in[i] && Cross(c,a,b)>0);
}
cnt+=in[i];
}
for(ll i=1;i<=n;i++){
for(ll j=1;j<=n;j++){
if (i==j) continue;
bool yes=true;
for(ll l=1;l<=m;l++){
if (in[l] && Cross(h[i],h[j],t[l])<0){
yes=false;
break;
}
}
if(yes) G[i].push_back(j);
}
}
for(ll i=1;i<=n;i++){
for(ll j=1;j<=n;j++) dist[j]=LLONG_MAX;
dist[i]=1;
ll minn=LLONG_MAX;
queue<ll> q;
q.push(i);
while (!q.empty()){
ll t=q.front();
q.pop();
for (ll next : G[t]){
if (next==i) minn=min(minn,dist[t]);
if (dist[t]+1<dist[next]){
dist[next]=dist[t]+1;
q.push(next);
}
}
}
if(minn!=LLONG_MAX) ans=min(ans,(m-cnt)*111+minn*20);
}
cout << ans;
return 0;
}
Compilation message
fence.cpp: In function 'int main()':
fence.cpp:61:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<TT>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
61 | for(ll i=0;i<ch.size() && ch.size()>2;){//Remove free hole from "Convex holl"
| ~^~~~~~~~~~
fence.cpp:64:6: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
64 | for(ll j=1;j<=m;j++)
| ^~~
fence.cpp:69:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
69 | if(ok)ch.erase(ch.begin()+i);
| ^~
fence.cpp:81:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<TT>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
81 | for(ll j=0;j<ch.size();j++){
| ~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
1 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
1 ms |
500 KB |
Output is correct |
