제출 #825327

#제출 시각아이디문제언어결과실행 시간메모리
825327FEDIKUSRectangles (IOI19_rect)C++17
0 / 100
1 ms596 KiB
#include "rect.h" #include<iostream> #include<vector> #include<stack> #include<set> #include<map> #include<algorithm> using namespace std; using ll = long long; using pii = pair<int,int>; const int maxn=2510; int n,m; vector<vector<int> > a; int ul[maxn][maxn],ud[maxn][maxn]; set<pii> ver[maxn]; //vector<int> sl[maxn][4*maxn],sr[maxn][4*maxn]; // -1 = nema, -2 = ima suvise, else = vrednost int tmp[maxn]; void build(vector<int>* segt,int *a,int ind=1,int l=0,int r=n-1){ if(l==r){segt[ind]={a[l]}; return;} int mid=l+(r-l)/2; build(segt,a,2*ind,l,mid); build(segt,a,2*ind+1,mid+1,r); merge(segt[2*ind].begin(),segt[2*ind].end(),segt[2*ind+1].begin(),segt[2*ind+1].end(),back_inserter(segt[ind])); } int query(vector<int> *segt,int tl,int tr,int t,int ind=1,int l=0,int r=n-1){ if(tl<=l && r<=tr){ return upper_bound(segt[ind].begin(),segt[ind].end(),t)-lower_bound(segt[ind].begin(),segt[ind].end(),t); } int mid=l+(r-l)/2; int ret=0; if(tl<=mid) ret+=query(segt,tl,tr,t,2*ind,l,mid); if(tr>mid) ret+=query(segt,tl,tr,t,2*ind+1,mid+1,r); return ret; } int res=0; ll count_rectangles(vector<vector<int> > _a){ swap(a,_a); n=a.size(); m=a[0].size(); for(int i=0;i<n;i++){ stack<int> stek; for(int j=0;j<m;j++){ while(!stek.empty() && a[i][stek.top()]<a[i][j]) stek.pop(); if(stek.empty()) ul[i][j]=-1; else ul[i][j]=stek.top(); stek.push(j); } while(!stek.empty()) stek.pop(); for(int j=m-1;j>=0;j--){ while(!stek.empty() && a[i][stek.top()]<a[i][j]) stek.pop(); if(stek.empty()) ud[i][j]=-1; else ud[i][j]=stek.top(); stek.push(j); } while(!stek.empty()) stek.pop(); } return 0; for(int i=0;i<m;i++){ stack<int> stek; for(int j=0;j<n;j++){ while(!stek.empty() && a[stek.top()][i]<a[j][i]) stek.pop(); if(!stek.empty()){ver[i].emplace(pii(stek.top(),j));} stek.push(j); } while(!stek.empty()) stek.pop(); for(int j=n-1;j>=0;j--){ while(!stek.empty() && a[stek.top()][i]<a[j][i]) stek.pop(); if(!stek.empty()){ver[i].emplace(pii(j,stek.top()));} stek.push(j); } while(!stek.empty()) stek.pop(); } for(int i=0;i<n;i++){ for(int j=0;j<m;j++){ if(ud[i][j]==-1) continue; if(ud[i][j]==j+1) ud[i][j]=-1; if(ul[i][j]==j-1) ul[i][j]=-1; if(a[i][j]!=a[i][ud[i][j]]) continue; ud[i][j]=-1; } } for(int i=0;i<m;i++){ for(int j=0;j<n;j++) tmp[j]=ul[j][i]; //build(sl[i],tmp); for(int j=0;j<n;j++) tmp[j]=ud[j][i]; //build(sr[i],tmp); } // desni cosak map<pii,int> tren; for(int j=1;j<m;j++){ map<pii,int> novi; for(pii x:ver[j]){ if(x.second-x.first==1) continue; if(tren.find(x)==tren.end()) novi[x]=j; else novi[x]=tren[x]; } for(auto x:tren){ int u,d,r,l; u=x.first.first; d=x.first.second; r=j; l=x.second-1; if(ul[u+1][r]==-1) continue; if(ul[u+1][r]<l) continue; l=ul[u+1][r]; int klk=0; for(int i=u+1;i<=d-1;i++) klk+=int(ud[i][l]==r); for(int i=u+1;i<=d-1;i++) klk+=int(ul[i][r]==l); //if(query(sr[l],u+1,d-1,r)+query(sl[r],u+1,d-1,l)!=d-u-1) continue; if(klk!=d-u-1) continue; #ifdef DEBUG cout<<u<<" "<<d<<" "<<l<<" "<<r<<"\n"; #endif res++; } swap(tren,novi); } tren.clear(); // levi cosak for(int j=m-2;j>=0;j--){ map<pii,int> novi; for(pii x:ver[j]){ if(x.second-x.first==1) continue; if(tren.find(x)==tren.end()) novi[x]=j; else novi[x]=tren[x]; } for(auto x:tren){ int u,d,r,l; u=x.first.first; d=x.first.second; l=j; r=x.second+1; if(ud[u+1][l]==-1) continue; if(ud[u+1][l]>r) continue; r=ud[u+1][l]; int klk=0; for(int i=u+1;i<=d-1;i++) klk+=int(ud[i][l]==r); for(int i=u+1;i<=d-1;i++) klk+=int(ul[i][r]==l); //if(query(sr[l],u+1,d-1,r)+query(sl[r],u+1,d-1,l)!=d-u-1) continue; if(klk!=d-u-1) continue; #ifdef DEBUG cout<<u<<" "<<d<<" "<<l<<" "<<r<<"\n"; #endif res++; } swap(tren,novi); } tren.clear(); return res; }
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