Submission #758866

#TimeUsernameProblemLanguageResultExecution timeMemory
758866inksamurai허수아비 (JOI14_scarecrows)C++17
0 / 100
4037 ms25772 KiB
#include <bits/stdc++.h> // cut here #ifdef _MSC_VER #include <intrin.h> #endif namespace atcoder { namespace internal { int ceil_pow2(int n) { int x = 0; while ((1U << x) < (unsigned int)(n)) x++; return x; } int bsf(unsigned int n) { #ifdef _MSC_VER unsigned long index; _BitScanForward(&index, n); return index; #else return __builtin_ctz(n); #endif } } // namespace internal } // namespace atcoder namespace atcoder { template <class S, S (*op)(S, S), S (*e)()> struct segtree { public: segtree() : segtree(0) {} segtree(int n) : segtree(std::vector<S>(n, e())) {} segtree(const std::vector<S>& v) : _n(int(v.size())) { log = internal::ceil_pow2(_n); size = 1 << log; d = std::vector<S>(2 * size, e()); for (int i = 0; i < _n; i++) d[size + i] = v[i]; for (int i = size - 1; i >= 1; i--) { update(i); } } void set(int p, S x) { assert(0 <= p && p < _n); p += size; d[p] = x; for (int i = 1; i <= log; i++) update(p >> i); } S get(int p) { assert(0 <= p && p < _n); return d[p + size]; } S prod(int l, int r) { assert(0 <= l && l <= r && r <= _n); S sml = e(), smr = e(); l += size; r += size; while (l < r) { if (l & 1) sml = op(sml, d[l++]); if (r & 1) smr = op(d[--r], smr); l >>= 1; r >>= 1; } return op(sml, smr); } S all_prod() { return d[1]; } template <bool (*f)(S)> int max_right(int l) { return max_right(l, [](S x) { return f(x); }); } template <class F> int max_right(int l, F f) { assert(0 <= l && l <= _n); assert(f(e())); if (l == _n) return _n; l += size; S sm = e(); do { while (l % 2 == 0) l >>= 1; if (!f(op(sm, d[l]))) { while (l < size) { l = (2 * l); if (f(op(sm, d[l]))) { sm = op(sm, d[l]); l++; } } return l - size; } sm = op(sm, d[l]); l++; } while ((l & -l) != l); return _n; } template <bool (*f)(S)> int min_left(int r) { return min_left(r, [](S x) { return f(x); }); } template <class F> int min_left(int r, F f) { assert(0 <= r && r <= _n); assert(f(e())); if (r == 0) return 0; r += size; S sm = e(); do { r--; while (r > 1 && (r % 2)) r >>= 1; if (!f(op(d[r], sm))) { while (r < size) { r = (2 * r + 1); if (f(op(d[r], sm))) { sm = op(d[r], sm); r--; } } return r + 1 - size; } sm = op(d[r], sm); } while ((r & -r) != r); return 0; } private: int _n, size, log; std::vector<S> d; void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); } }; } // namespace atcoder // cut here #define int ll using namespace std; #define rep(i,n) for(int i=0;i<n;i++) #define per(i,n) for(int i=n-1;i>=0;i--) #define rng(i,c,n) for(int i=c;i<n;i++) #define fi first #define se second #define pb push_back #define sz(a) (int)a.size() #define vec(...) vector<__VA_ARGS__> #define _3CFsQPb ios::sync_with_stdio(0),cin.tie(0) typedef long long ll; using pii=pair<int,int>; using vi=vector<int>; void print(){cout<<'\n';} template<class h,class...t> void print(const h&v,const t&...u){cout<<v<<' ',print(u...);} #define all(a) a.begin(), a.end() int op(int l,int r){ return l+r; } int e(){ return 0; } void slv(){ int n; cin>>n; vec(pii) a(n); rep(i,n){ cin>>a[i].fi>>a[i].se; // swap(a[i].fi,a[i].se); } vi tmp; rep(i,n){ tmp.pb(a[i].fi),tmp.pb(a[i].se); } sort(all(tmp)); tmp.erase(unique(all(tmp)),tmp.end()); const int si=sz(tmp); rep(i,n){ a[i].fi=lower_bound(all(tmp),a[i].fi)-tmp.begin(); a[i].se=lower_bound(all(tmp),a[i].se)-tmp.begin(); } // rep(i,n){ // print(a[i].fi,a[i].se); // } int ans=0; atcoder::segtree<int,op,e> seg(si); auto rec=[&](auto self,int l,int r,vec(pii) a)->void{ int n=sz(a); if(!n or l>=r){ return; } int m=(l+r)/2; // print(l,r,m); vec(pii) up,lo; for(auto p:a){ if(p.se>=m){ up.pb(p); }else{ lo.pb(p); } } sort(all(up),[&](pii l,pii r){ return l.fi>r.fi; }); sort(all(lo),[&](pii l,pii r){ return l.fi>r.fi; }); // print("here goes up"); // for(auto p:up){ // print(p.fi,p.se); // } // print("here goes lo"); // for(auto p:lo){ // print(p.fi,p.se); // } if(m>l){ self(self,m,r,up); } if(m-1>l){ self(self,l,m-1,lo); } print(l,r,m); set<pii> stup,stlo; int i=0,j=0; while(i<sz(up) or j<sz(lo)){ int typ=0; if(j==sz(lo)){ typ=1; }else if(i==sz(up)){ typ=0; }else if(up[i].fi>lo[j].fi){ typ=1; } if(typ){ // print(i,j,sz(up),sz(lo)); pii p=up[i]; while(sz(stup)){ pii q=*prev(stup.end()); if(p.se>q.fi){ break; } seg.set(q.fi,seg.get(q.fi)-1); stup.erase(prev(stup.end())); } seg.set(p.se,seg.get(p.se)+1); stup.insert({p.se,p.fi}); i+=1; }else{ int to=si; pii p=lo[j]; for(auto q:stlo){ if(q.se>p.se){ to=min(to,q.fi); } } // while(sz(stlo)){ // pii q=*prev(stlo.end()); // if(p.se>q.fi){ // break; // } // to=min(to,q.se); // stlo.erase(prev(stlo.end())); // } // if(l==0 and r==si-1 and p.fi==2 and p.se==1){ // for(auto p:stlo){ // print(p.se,p.fi); // } // } // print("rabbits",p.fi,p.se,to,seg.prod(lo[j].se,to)); ans+=seg.prod(lo[j].fi,to); stlo.insert({p.fi,p.se}); j+=1; } } for(auto p:up){ seg.set(p.se,0); } }; rec(rec,0,si-1,a); print(ans); } signed main(){ _3CFsQPb; slv(); }
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