Submission #439023

#	Time	Username	Problem	Language	Result	Execution time	Memory
439023		2548631	Sjeckanje (COCI21_sjeckanje)	C++17	110 / 110	886 ms	49220 KiB

Main

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef complex<ld> cp;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vii;
typedef vector<cp> vcp;
typedef vector<ld> vld;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef vector<vii> vvii;

#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL)
#define forw(i,l,r) for( int i = (l) ; i < (r) ; i++ )
#define forb(i,r,l) for( int i = (r) ; i >= (l) ; i-- )
#define log2i(x) (64 - __builtin_clzll(1ll*(x)) - 1)
#define numBit(x) (__builtin_popcountll(1ll*(x)))
#define getBit(x,i) ((x)>>(i)&1)
#define Pi acos(-1.0l)
#define sz(x) int(x.size())
#define mt make_tuple
#define mp make_pair
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define pob pop_back
#define pof pop_front
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define debug(x) cerr << #x << " = " << x << '\n';

const int N = 2e5+7;
const ll inf = 3e18l+7;
int n,q;
ll a[N];

struct Node {
    ll val[4],lhs,rhs;
    Node():lhs(0),rhs(0) {
        forw(i,0,4) val[i]=0;
    }
    Node(ll x):lhs(x),rhs(x) {
        forw(i,0,4) val[i]=0;
        val[3]=abs(x);
    }
    ll operator [](int x) const {return val[x];}
    ll& operator [](int x) {return val[x];}
};

Node merge(const Node &x, const Node &y) {
    Node res;
    res.lhs=x.lhs;
    res.rhs=y.rhs;
    forw(i,0,4) forw(j,0,3+(x.rhs*y.lhs>=0)) {
        res[i]=max(res[i],x[i/2*2+j/2]+y[j%2*2+i%2]);
    }
    return res;
}

struct SegTree {
    vector<Node> _a;
    int _n;
    SegTree():_a(0),_n(0) {}
    ll operator [](int x) const {return _a[1].val[x];}
    ll& operator [](int x) {return _a[1].val[x];}
    void init(int len) {
        _a.assign(4*(_n=len)+4,Node());
        build(1,0,_n-1);
    }
    void build(int idx, int l, int r) {
        if(l==r) _a[idx]=Node(a[l]);
        else {
            int mid=(l+r)>>1, k=idx<<1;
            build(k,l,mid);
            build(k+1,mid+1,r);
            _a[idx]=merge(_a[k],_a[k+1]);
        }
    }
    void upd(int x, ll v, int idx, int l, int r) {
        if(x<l||r<x||l>r) return;
        if(l==r) _a[idx]=Node(_a[idx].rhs+v);
        else {
            int mid=(l+r)>>1, k=idx<<1;
            upd(x,v,k,l,mid);
            upd(x,v,k+1,mid+1,r);
            _a[idx]=merge(_a[k],_a[k+1]);
        }
    }
    void upd(int x, ll v) {upd(x,v,1,0,_n-1);}
}T;

int main() {
    fastIO;
#ifndef ONLINE_JUDGE
    //freopen("test.inp","r",stdin);
    //freopen("test.out","w",stdout);
#endif // ONLINE_JUDGE

    cin >> n >> q;
    forw(i,0,n) cin >> a[i];
    forw(i,0,n-1) a[i]=a[i+1]-a[i];
    T.init(n-1);
    while(q--) {
        int l,r,x; cin >> l >> r >> x;
        l--, r--;
        T.upd(l-1,x); T.upd(r,-x);
        ll ans=-inf;
        forw(i,0,4) ans=max(ans,T[i]);
        cout << ans << '\n';
    }
    return 0;
}

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