이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
/*huypheu
15
10 3 30
5 10 -17
4 -5 14
0 -3 -9
-2 3 17
6 9 -19
-9 -6 -14
-2 -3 10
-3 -3 30
8 1 -28
9 -9 -5
7 -5 -24
-8 -10 5
-7 2 20
10 -3 -13
*/
//https://oj.uz/problem/view/JOI17_bulldozer
#include <bits/stdc++.h>
#define int long long
#define oo (LLONG_MAX/2)
using namespace std;
struct ite
{
int val,lef,rig,tot;
}it[100007];
int x[20007],y[20007];
int pos[20007];
int c[20007],ar[20007];
void build(int node,int l,int r)
{
if(l>r) return ;
if(l==r)
{
it[node].lef=max(0ll,ar[l]);
it[node].rig=max(0ll,ar[l]);
it[node].tot=ar[l];
it[node].val=max(0ll,ar[l]);
return ;
}
int mid=(l+r)/2;
build(node*2,l,mid);
build(node*2+1,mid+1,r);
it[node].lef=max(it[node*2].lef,it[node*2].tot+it[node*2+1].lef);
it[node].rig=max(it[node*2+1].rig,it[node*2+1].tot+it[node*2].rig);
it[node].tot=it[node*2].tot+it[node*2+1].tot;
it[node].val=max(it[node*2].rig+it[node*2+1].lef,max(it[node*2].val,it[node*2+1].val));
return ;
}
void update(int node,int l,int r,int m,int p)
{
if(l>r) return ;
if(l==r)
{
it[node].lef=max(0ll,p);
it[node].rig=max(0ll,p);
it[node].tot=p;
it[node].val=max(0ll,p);
return ;
}
int mid=(l+r)/2;
if(m<=mid) update(node*2,l,mid,m,p); else update(node*2+1,mid+1,r,m,p);
it[node].lef=max(it[node*2].lef,it[node*2].tot+it[node*2+1].lef);
it[node].rig=max(it[node*2+1].rig,it[node*2+1].tot+it[node*2].rig);
it[node].tot=it[node*2].tot+it[node*2+1].tot;
it[node].val=max(it[node*2].rig+it[node*2+1].lef,max(it[node*2].val,it[node*2+1].val));
return ;
}
vector <int> vo;
vector <pair<int,int> > v;
double cura,curb;
vector <pair<int,int> > vnone;
map <pair<int,int> ,vector <pair<int,int> > > mapu;
pair<int,int> fap(int a,int b)
{
int k=__gcd(a,b);
a/=k;
b/=k;
if(b<0) b=-b,a=-a;
return make_pair(a,b);
}
bool cmp(pair<int,int> a,pair<int,int> b)
{
return (a.first*b.second>b.first*a.second);
}
bool cmp2(int a,int b)
{
return (y[a]*curb-cura*x[a]<y[b]*curb-cura*x[b]);
}
bool cmp3(pair<int,int> a,pair<int,int> b)
{
if(a.first!=b.first) return (x[a.first]<x[b.first]); else return (x[a.second]<x[b.second]);
}
int n;
void swapy(int a,int b)
{
int c,d;
c=pos[a],d=pos[b];
update(1,1,n,d,ar[c]);
update(1,1,n,c,ar[d]);
swap(ar[c],ar[d]);
swap(pos[a],pos[b]);
swap(vo[pos[a]-1],vo[pos[b]-1]);
return ;
}
signed main()
{
cin >> n;
for(int i=1;i<=n;i++)
{
cin >> x[i] >> y[i] >> c[i];
}
for(int i=1;i<n;i++)
{
for(int j=i+1;j<=n;j++)
{
pair<int,int> s;
s=fap((y[j]-y[i]),(x[j]-x[i]));
int si=i,sj=j;
if(x[si]>x[sj]) swap(si,sj);
if(mapu.find(s)==mapu.end())
{
mapu[s]=vnone;
mapu[s].push_back(make_pair(si,sj));
v.push_back(s);
}
else mapu[s].push_back(make_pair(si,sj));
}
}
sort(v.begin(),v.end(),cmp);
for(int i=1;i<=n;i++) vo.push_back(i);
cura=v[v.size()-1].first,curb=v[v.size()-1].second;
if(curb==0) curb=1; else cura--;
sort(vo.begin(),vo.end(),cmp2);
for(int i=0;i<(int)vo.size();i++)
{
pos[vo[i]]=i+1;
ar[i+1]=c[vo[i]];
}
build(1,1,n);
int ans=it[1].val;
// for(int j=0;j<vo.size();j++) cout << vo[j] << " ";
// cout << endl;
for(int i=0;i<(int)v.size()-1;i++)
{
vector <pair<int,int> > sub=mapu[v[i]];
sort(sub.begin(),sub.end(),cmp3);
for(int j=0;j<sub.size();j++)
{
swapy(sub[j].first,sub[j].second);
}
// for(int j=0;j<vo.size();j++) cout << vo[j] << " ";
// cout << endl;
ans=max(ans,it[1].val);
}
cout << ans << endl;
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
bulldozer.cpp: In function 'int main()':
bulldozer.cpp:163:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<sub.size();j++)
~^~~~~~~~~~~
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