제출 #103931

#제출 시각아이디문제언어결과실행 시간메모리
103931Bodo171Bulldozer (JOI17_bulldozer)C++14
60 / 100
1256 ms47484 KiB
#include <iostream> #include <fstream> #include <algorithm> using namespace std; const int nmax=2005; struct point { long long x,y,val; }v[nmax]; struct line { long long nr,nm; int i1,i2; }pp[nmax*nmax/2]; struct node { long long mxsuf,mxpref,sum; }arb[4*nmax],ans; pair<long long,long long> lin=make_pair(-2*1000*1000*1000-1,1); bool compP(point unu,point doi) { return (1LL*unu.x*lin.first+1LL*unu.y*lin.second<1LL*doi.x*lin.first+1LL*doi.y*lin.second); } bool compL(line unu,line doi) { return (1LL*unu.nr*doi.nm<1LL*unu.nm*doi.nr); } int ord[nmax]; long long A[nmax]; int n,i,j,nr,I,J,poz; long long act,mx; void mrg(node &A,node B,node C) { A.sum=1LL*B.sum+C.sum; A.mxpref=max(B.mxpref,B.sum+C.mxpref); A.mxsuf=max(C.mxsuf,C.sum+B.mxsuf); } void update(int nod,int l,int r,int poz,long long val) { if(l==r) { arb[nod].mxpref=arb[nod].mxsuf=max(val,0LL); arb[nod].sum=val; return; } int m=(l+r)/2; if(poz<=m) update(2*nod,l,m,poz,val); else update(2*nod+1,m+1,r,poz,val); mrg(arb[nod],arb[2*nod],arb[2*nod+1]); } void query(int nod,int l,int r,int st,int dr) { if(st<=l&&r<=dr) { mrg(ans,ans,arb[nod]); return; } int m=(l+r)/2; if(st<=m) query(2*nod,l,m,st,dr); if(m<dr) query(2*nod+1,m+1,r,st,dr); } int abss(int x) { if(x<0) return -x; return x; } void slv() { for(int i=1;i<=n;i++) { act=0; for(int j=i;j<=n;j++) { act+=v[j].val; if(act>mx) mx=act; } } } int main() { //freopen("data.in","r",stdin); cin>>n; bool solve0=1; for(i=1;i<=n;i++) { cin>>v[i].x>>v[i].y>>v[i].val; mx=max(mx,v[i].val); if(v[i].y!=0) solve0=0; } sort(v+1,v+n+1,compP); if(solve0) { slv(); cout<<mx; return 0; } for(i=1;i<=n;i++) { ord[i]=i; update(1,1,n,i,v[i].val); } for(i=1;i<=n;i++) for(j=i+1;j<=n;j++) if(v[i].x==v[j].x) { act=0; ans.mxpref=ans.sum=ans.mxsuf=0; if(i>=1)query(1,1,n,1,i); act+=ans.mxsuf; ans.mxpref=ans.sum=ans.mxsuf=0; if(j<=n) query(1,1,n,j,n); act+=ans.mxpref; if(act>mx) mx=1LL*act; } else { pp[++nr]={v[j].y-v[i].y,v[j].x-v[i].x,i,j}; if(pp[nr].nm<0) pp[nr].nr*=-1,pp[nr].nm*=-1; } sort(pp+1,pp+nr+1,compL); for(i=1;i<=nr;i++) { I=pp[i].i1;J=pp[i].i2; swap(ord[I],ord[J]); poz=min(ord[I],ord[J]); update(1,1,n,ord[I],v[I].val); update(1,1,n,ord[J],v[J].val); act=0; ans.mxpref=ans.sum=ans.mxsuf=0; if(poz>=1)query(1,1,n,1,poz); act+=ans.mxsuf; ans.mxpref=ans.sum=ans.mxsuf=0; if(poz+1<=n)query(1,1,n,poz+1,n); act+=ans.mxpref; if(act>mx) mx=1LL*act; } cout<<mx; return 0; }
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