oj.uz

답안 #759025

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
759025 2023-06-15T16:58:40 Z inksamurai 허수아비 (JOI14_scarecrows) C++17
100 / 100
 844 ms 43308 KB 
#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 _3p5IrEq 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;
	}

	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();
	}

	int ans=0;
	atcoder::segtree<int,op,e> seg(si);
	auto rec=[&](auto self,int l,int r,vec(pii) a)->void{
		if(l>=r-1){
			return;
		}
		int n=sz(a);
		int m=(l+r)/2;
		vec(pii) up,lo;
		rep(i,n){
			if(a[i].se>=m){
				up.pb(a[i]);
			}else{
				lo.pb(a[i]);
			}
		}
		sort(all(up)),reverse(all(up));
		sort(all(lo)),reverse(all(lo));
		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){
				pii p=up[i];
				while(sz(stup)){
					auto it=prev(stup.end());
					pii q=*it;
					if(p.se<q.fi){
						seg.set(q.se,seg.get(q.se)-1);
						stup.erase(it);
					}else{
						break;
					}
				}
				seg.set(p.fi,seg.get(p.fi)+1);
				stup.insert({p.se,p.fi});
				i+=1;
			}else{
				int to=si;
				pii p=lo[j];
				while(sz(stlo)){
					auto it=stlo.begin();
					pii q=*it;
					if(p.se>q.fi){
						stlo.erase(it);
					}else{
						break;
					}
				}
				auto it=stlo.lower_bound({p.se,-1});
				if(it!=stlo.end()){
					to=min(to,(*it).se);
				}
				ans+=seg.prod(p.fi,to);
				stlo.insert({p.se,p.fi});
				j+=1;
			}
		}
		for(auto p:up){
			seg.set(p.fi,0);
		}
		self(self,l,m,lo);
		self(self,m,r,up);
	};
	rec(rec,0,si,a);

	print(ans);
}

signed main(){
_3p5IrEq;
	slv();
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 1236 KB Output is correct
2 Correct 13 ms 1108 KB Output is correct
3 Correct 12 ms 1236 KB Output is correct
4 Correct 9 ms 1236 KB Output is correct
5 Correct 12 ms 1108 KB Output is correct
6 Correct 13 ms 1120 KB Output is correct
7 Correct 13 ms 1096 KB Output is correct
8 Correct 11 ms 1500 KB Output is correct
9 Correct 13 ms 1108 KB Output is correct
10 Correct 13 ms 1108 KB Output is correct
11 Correct 13 ms 1160 KB Output is correct
12 Correct 10 ms 1284 KB Output is correct

Subtask #3
85.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 598 ms 37216 KB Output is correct
2 Correct 844 ms 28988 KB Output is correct
3 Correct 728 ms 33052 KB Output is correct
4 Correct 595 ms 37636 KB Output is correct
5 Correct 703 ms 31884 KB Output is correct
6 Correct 788 ms 29736 KB Output is correct
7 Correct 808 ms 28984 KB Output is correct
8 Correct 816 ms 29328 KB Output is correct
9 Correct 669 ms 43308 KB Output is correct
10 Correct 767 ms 30572 KB Output is correct
11 Correct 795 ms 29596 KB Output is correct
12 Correct 812 ms 29572 KB Output is correct
13 Correct 838 ms 29540 KB Output is correct
14 Correct 677 ms 41904 KB Output is correct
15 Correct 794 ms 29004 KB Output is correct
16 Correct 833 ms 29300 KB Output is correct
17 Correct 520 ms 19796 KB Output is correct
18 Correct 742 ms 33876 KB Output is correct
19 Correct 750 ms 33236 KB Output is correct
20 Correct 725 ms 33028 KB Output is correct