Submission #125022

#	Time	Username	Problem	Language	Result	Execution time	Memory
125022		trinhhung	Sterilizing Spray (JOI15_sterilizing)	C++14	10 / 100	196 ms	6908 KiB

sterilizing

#include<bits/stdc++.h>

using namespace std;

#define int long long

const int N = 1e5 + 5;
int n, m, q;
int a[N], node[4 * N], lazy[4 * N];

void down(int i, int l, int r){
    if(l > r) return;
    node[i] /= lazy[i];
    if(l == r){
        lazy[i] = 1;
        return;
    }
    lazy[i * 2] *= lazy[i];
    lazy[i * 2 + 1] *= lazy[i];
    lazy[i] = 1;
}

void build_tree(int i, int l, int r){
    if(l > r) return;
    if(l == r){
        node[i] = a[l];
        return;
    }
    int mid = (l + r) / 2;
    build_tree(i * 2, l, mid);
    build_tree(i * 2 + 1, mid + 1, r);
    node[i] = node[i * 2] + node[i * 2 + 1];
}

void update(int i, int l, int r, int pos, int val){
    down(i, l, r);
    if(l > r || l > pos || r < pos) return;
    if(l == r){
        if(l == pos)
            node[i] = val;
        return;
    }
    int mid = (l + r) / 2;
    update(i * 2, l, mid, pos, val);
    update(i * 2 + 1, mid + 1, r, pos, val);
    node[i] = node[i * 2] + node[i * 2 + 1];
}

void update_2(int i, int l, int r, int a, int b){
    down(i, l, r);
    if(l > r || l > b || r < a) return;
    if(l >= a && r <= b){
        lazy[i] *= m;
        down(i, l, r);
        return;
    }
    int mid = (l + r) / 2;
    update_2(i * 2, l, mid, a, b);
    update_2(i * 2 + 1, mid + 1, r, a, b);
    node[i] = node[i * 2] + node[i * 2 + 1];
}

int get(int i, int l, int r, int a, int b){
    down(i, l, r);
    if(l > r || l > b || r < a) return 0;
    if(l >= a && r <= b) return node[i];
    int mid = (l + r) / 2;
    return get(i * 2, l, mid, a, b) + get(i * 2 + 1, mid + 1, r, a, b);
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> q >> m;
    for(int i = 1; i <= 4 * n; ++ i) lazy[i] = 1;
    for(int i = 1; i <= n; ++ i) cin >> a[i];
    build_tree(1, 1, n);
    while(q --){
        int x, y, z;
        cin >> x >> y >> z;
        if(x == 1)
            update(1, 1, n, y, z);
        else if(x == 2)
            update_2(1, 1, n, y, z);
        else
            cout << get(1, 1, n , y, z) << '\n';
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75