Submission #245272

#	Time	Username	Problem	Language	Result	Execution time	Memory
245272		WhaleVomit	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	30 / 100	1086 ms	22456 KiB

foehn_phenomena

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

#define f first
#define s second
#define pb push_back
#define mp make_pair
#define all(v) v.begin(), v.end()
#define sz(v) (int)v.size()

#define MOO(i, a, b) for(int i=a; i<b; i++)
#define M00(i, a) for(int i=0; i<a; i++)
#define MOOd(i,a,b) for(int i = (b)-1; i >= a; i--)
#define M00d(i,a) for(int i = (a)-1; i>=0; i--)

#define FAST ios::sync_with_stdio(0); cin.tie(0);
#define finish(x) return cout << x << '\n', 0;
#define dbg(x) cerr << ">>> " << #x << " = " << x << "\n";
#define _ << " _ " <<

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int,int> pi;
typedef pair<ld,ld> pd;
typedef complex<ld> cd;

template<class T> struct node {
    T val;
    T lazy;
    int l, r;
    node* left;
    node* right;
    node(int l, int r) {
        this -> l = l;
        this -> r = r;
        this -> left = nullptr;
        this -> right = nullptr;
    }
};

template<class T, int SZ> struct segtree {
    // modify these
    T combIdentity = 0;
    T comb(T l, T r) {
        return l+r;
    }
    T pushIdentity = 0;
    void push(node<T>* n) {
        n->val += n->lazy*(n->r - n->l + 1);
        if(n->l != n->r) {
            n->left->lazy += n->lazy;
            n->right->lazy += n->lazy;
        }
        n->lazy = pushIdentity;
    }

    node<T>* root;
    segtree() {
        int ub = 1;
        while(ub < SZ) ub *= 2;
        root = new node<T>(0, ub-1);
        root->val = pushIdentity;
        root->lazy = pushIdentity;
    }
    void propagate(node<T>* n) {
        if(n->l != n->r) {
            int mid = ((n->l) + (n->r))/2;
            if(n->left == nullptr) {
                n->left = new node<T>(n->l, mid);
                n->left->val = pushIdentity;
                n->left->lazy = pushIdentity;
            }
            if(n->right == nullptr) {
                n->right = new node<T>(mid+1, n->r);
                n->right->val = pushIdentity;
                n->right->lazy = pushIdentity;
            }
        }
        push(n);
    }
    void updN(node<T>* n, int i1, int i2, T val) {
        propagate(n);
        if(i2 < n->l || i1 > n->r) return;
        if(i1 <= n->l && i2 >= n->r) {
            n->lazy = val;
            push(n);
            return;
        }

        updN(n->left, i1, i2, val);
        updN(n->right, i1, i2, val);
        n->val = comb(n->left->val, n->right->val);
    }
    void upd(int i1, int i2, T val) {
        updN(root, i1, i2, val);
    }
    T queryN(node<T>* n, int i1, int i2) {
        propagate(n);
        if(i2 < n->l || i1 > n->r) return combIdentity;
        if(n->l >= i1 && n->r <= i2) return n->val;

        T a = combIdentity;
        if(n->left != nullptr) a = comb(a, queryN(n->left, i1, i2));
        if(n->right != nullptr) a = comb(a, queryN(n->right, i1, i2));

        return a;
    }
    T query(int i1, int i2) {
        return queryN(root, i1, i2);
    }
};

const int MAX_N = 200200;
segtree<ll,MAX_N> st;
ll S, T;

ll get(int i) {
    ll x1 = st.query(i,i);
    ll x2 = st.query(i+1,i+1);
    if(x1 < x2) return -S*(x2-x1);
    else return T*(x1-x2);
}

int main() { FAST
    int n, q;
    cin >> n >> q >> S >> T;
    n++;
    vector<ll> arr(n);
    M00(i, n) cin >> arr[i];
    M00(i, n) st.upd(i, i, arr[i]);
    ll ans = 0;
    M00(i, n-1) ans += get(i);
    M00(i, q) {
        int l, r, x; cin >> l >> r >> x;
        if(l != 0) ans -= get(l-1);
        if(r != n-1) ans -= get(r);
        st.upd(l,r,x);
        if(l != 0) ans += get(l-1);
        if(r != n-1) ans += get(r);
        cout << ans << "\n";
    }
}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60