Submission #490876

#	Time	Username	Problem	Language	Result	Execution time	Memory
490876		inksamurai	Sjeckanje (COCI21_sjeckanje)	C++17	110 / 110	580 ms	34916 KiB

Main

#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 fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define crep(i,x,n) for(int i=x;i<n;i++)
#define drep(i,n) for(int i=n-1;i>=0;i--)
#define vec(...) vector<__VA_ARGS__>
#define _3cSpNGp ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
using pii=pair<int,int>;
using vi=vector<int>;

const ll inf=1e12;

struct node{
	ll val[2][2];
	ll back;
	void init(ll _back){
		back=_back;
		val[0][0]=val[1][1]=0;
		val[0][1]=val[1][0]=-inf;
	}
};
node _e;

node op(node l,node r){
	node now;
	now.init(r.back);
	rep(tl,2)rep(tr,2){
		ll merged=0,additional=0;
		
		additional=max(0ll,l.back);
		merged=l.val[tl][0]+r.val[0][tr]+additional; // both positive
		now.val[tl][tr]=max(now.val[tl][tr],merged);
		
		if(l.back!=-inf){
			additional=max(0ll,-l.back);
		}
		merged=l.val[tl][1]+r.val[1][tr]+additional; // both negative
		now.val[tl][tr]=max(now.val[tl][tr],merged);
		
		merged=l.val[tl][0]+r.val[1][tr];
		now.val[tl][tr]=max(now.val[tl][tr],merged);
		
		merged=l.val[tl][1]+r.val[0][tr];
		now.val[tl][tr]=max(now.val[tl][tr],merged);
	}
	return now;
}

node e(){
	return _e;
}
int main(){
_3cSpNGp;
	_e.init(0);
	int n;
	cin>>n;
	int q;
	cin>>q;
	vi a(n);
	rep(i,n){
		cin>>a[i];
	}
	atcoder::segtree<node,op,e> seg(n-1);
	vec(ll) d;
	rep(i,n-1){
		node now;
		d.pb((ll)a[i+1]-a[i]);
		now.init(d.back());
		seg.set(i,now);
	}
	auto f_all=[&](int l,int r)->ll{
		node now=seg.prod(l,r);
		ll ans=-inf;
		rep(t,2)rep(t1,2){
			ans=max(ans,now.val[t][t1]);
		}
		return ans;
	};
	rep(_,q){
		int l,r;
		ll x;
		cin>>l>>r>>x;
		l--,r--;
		if(l) d[l-1]+=x;
		if(r!=n-1) d[r]-=x;
		node now;
		if(l){
			now.init(d[l-1]);
			seg.set(l-1,now);
		}
		if(r!=n-1){
			now.init(d[r]);
			seg.set(r,now);
		}
		ll ans=f_all(0,n-1);
		cout<<ans<<"\n";
	}
//	
	return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 55 / 55