Submission #989057

#TimeUsernameProblemLanguageResultExecution timeMemory
989057AdamGSComparing Plants (IOI20_plants)C++17
19 / 100
362 ms119632 KiB
#include "plants.h" #include<bits/stdc++.h> using namespace std; typedef long long ll; #define rep(a, b) for(int a = 0; a < (b); ++a) #define st first #define nd second #define pb push_back #define all(a) a.begin(), a.end() const int LIM=2e5+7, INF=1e9+7, LG=20; set<int>A, B; pair<int,int>tr[4*LIM]; int lazy[4*LIM], T[LIM], gdzie[LIM], nxt[LIM][LG], prv[LIM][LG], n, k, N=1; int tr2[4*LIM]; ll sumnxt[LIM][LG], sumprv[LIM][LG]; void spl(int v) { tr[2*v].st+=lazy[v]; tr[2*v+1].st+=lazy[v]; lazy[2*v]+=lazy[v]; lazy[2*v+1]+=lazy[v]; lazy[v]=0; } void upd(int v, int l, int r, int a, int b, int x) { if(r<a || b<l) return; if(a<=l && r<=b) { tr[v].st+=x; lazy[v]+=x; return; } if(lazy[v]) spl(v); int mid=(l+r)/2; upd(2*v, l, mid, a, b, x); upd(2*v+1, mid+1, r, a, b, x); tr[v]=min(tr[2*v], tr[2*v+1]); } pair<int,int>cnt(int v, int l, int r, int a, int b) { if(r<a || b<l) return {INF, INF}; if(a<=l && r<=b) return tr[v]; if(lazy[v]) spl(v); int mid=(l+r)/2; return min(cnt(2*v, l, mid, a, b), cnt(2*v+1, mid+1, r, a, b)); } int dyst(int a, int b) { if(a<b) return b-a; return n-a+b; } pair<int,int>licz(int x) { auto it=A.lower_bound(x); int a=-1, b=-1; if(it==A.end()) { auto it2=A.begin(); b=*it2; } else b=*it; if(it==A.begin()) { auto it2=A.end(); --it2; a=*it2; } else { --it; a=*it; } return {a, b}; } void dodaj(int x) { if(A.size()==0) { A.insert(x); B.insert(x); return; } pair<int,int>p=licz(x); int a=p.st, b=p.nd; if(dyst(x, b)<k && B.find(b)!=B.end()) B.erase(b); if(dyst(a, x)>=k) B.insert(x); A.insert(x); } void usun(int x) { A.erase(x); if(B.find(x)!=B.end()) B.erase(x); if(A.size()==1) B.insert(*A.begin()); if(A.size()<2) return; pair<int,int>p=licz(x); int a=p.st, b=p.nd; if(dyst(a, b)>=k) B.insert(b); } void upd2(int v, int x) { v+=N; tr2[v]=x; v/=2; while(v) { tr2[v]=min(tr2[2*v], tr2[2*v+1]); v/=2; } } int cnt2(int l, int r) { l+=N; r+=N; int ans=min(tr2[l], tr2[r]); while(l/2!=r/2) { if(l%2==0) ans=min(ans, tr2[l+1]); if(r%2==1) ans=min(ans, tr2[r-1]); l/=2; r/=2; } return ans; } void init(int _k, vector<int>r) { n=r.size(); k=_k; while(N<n) N*=2; rep(i, n) tr[N+i]={r[i], i}; for(int i=n; i<N; ++i) tr[N+i]={INF, INF}; for(int i=N-1; i; --i) tr[i]=min(tr[2*i], tr[2*i+1]); rep(i, n) { while(tr[1].st==0) { dodaj(tr[1].nd); upd(1, 0, N-1, tr[1].nd, tr[1].nd, INF); } int x=*B.begin(); usun(x); upd(1, 0, N-1, x-k+1, x, -1); if(x-k+1<0) upd(1, 0, N-1, n+x-k+1, n-1, -1); T[x]=n-i-1; gdzie[n-i-1]=x; } rep(i, 2*N) tr2[i]=INF; for(int i=n-1; i>=0; --i) { int p=gdzie[i]; int a=cnt2(p, min(p+k-1, n-1)); if(p+k-1>n-1) a=min(a, cnt2(0, p+k-1-n)); int b=cnt2(max(0, p-k+1), p); if(p-k+1<0) b=min(b, cnt2(n+p-k+1, n-1)); if(a==INF) a=i; if(b==INF) b=i; nxt[i][0]=a; prv[i][0]=b; sumnxt[i][0]=dyst(p, gdzie[a]); sumprv[i][0]=dyst(gdzie[b], p); upd2(p, i); } for(int j=1; j<LG; ++j) rep(i, n) { nxt[i][j]=nxt[nxt[i][j-1]][j-1]; prv[i][j]=prv[prv[i][j-1]][j-1]; sumnxt[i][j]=sumnxt[i][j-1]+sumnxt[nxt[i][j-1]][j-1]; sumprv[i][j]=sumprv[i][j-1]+sumprv[prv[i][j-1]][j-1]; } } bool mniejszy(int x, int y) { if(x>y) return false; if(nxt[x][LG-1]>=y) { int p=x; ll a=dyst(gdzie[x], gdzie[y]), b=0; for(int i=LG-1; i>=0; --i) if(nxt[p][i]<=y) { b+=sumnxt[p][i]; p=nxt[p][i]; } if(b>=a) return true; } if(prv[x][LG-1]>=y) { int p=x; ll a=dyst(gdzie[y], gdzie[x]), b=0; for(int i=LG-1; i>=0; --i) if(prv[p][i]<=y) { b+=sumprv[p][i]; p=prv[p][i]; } if(b>=a) return true; } return false; } int compare_plants(int x, int y) { if(mniejszy(T[x], T[y])) return -1; if(mniejszy(T[y], T[x])) return 1; return 0; }
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