답안 #604167

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
604167	2022-07-24T19:41:00 Z	inksamurai	Vudu (COCI15_vudu)	C++17	126 / 140	429 ms	65536 KB

vudu

#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 rng(i,c,n) for(int i=(c);i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3aFGabX 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...);}
// e
int op(int l,int r){return l+r;}
int e(){return 0;}

signed main(){
_3aFGabX;
	int n;
	cin>>n;
	vi a(n);
	rep(i,n){
		cin>>a[i];
	}
	int pvt;
	cin>>pvt;
	vi ps={0};
	rep(i,n){
		int v=a[i]-pvt;
		ps.pb(ps.back()+v);
	}
	vi tmp=ps;
	sort(tmp.begin(), tmp.end());
	tmp.erase(unique(tmp.begin(), tmp.end()),tmp.end());
	const int si_tmp=sz(tmp);
	atcoder::segtree<int,op,e> seg(n);
	seg.set((int)(lower_bound(tmp.begin(), tmp.end(),0)-tmp.begin()),1);
	int ans=0;
	rng(i,1,n+1){
		int v=(int)(lower_bound(tmp.begin(), tmp.end(),ps[i])-tmp.begin());
		// print(ps[i]);
		ans+=seg.prod(0,v+1);
		seg.set(v,seg.get(v)+1);
	}
	print(ans);
}

Compilation message

vudu.cpp: In function 'int main()':
vudu.cpp:181:12: warning: unused variable 'si_tmp' [-Wunused-variable]
  181 |  const int si_tmp=sz(tmp);
      |            ^~~~~~

Subtask #1

126.0 / 140.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	724 KB	Output is correct
2	Correct	2 ms	596 KB	Output is correct
3	Correct	3 ms	648 KB	Output is correct
4	Correct	429 ms	56368 KB	Output is correct
5	Correct	221 ms	39248 KB	Output is correct
6	Runtime error	209 ms	65536 KB	Execution killed with signal 6
7	Correct	373 ms	53428 KB	Output is correct
8	Correct	296 ms	48432 KB	Output is correct
9	Correct	395 ms	57772 KB	Output is correct
10	Correct	335 ms	52380 KB	Output is correct