cp-stuff/segmentTree.cpp at master · zunaid13/cp-stuff · GitHub

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/*
⡆⣐⢕⢕⢕⢕⢕⢕⢕⢕⠅⢗⢕⢕⢕⢕⢕⢕⢕⠕⠕⢕⢕⢕⢕⢕⢕⢕⢕⢕
⢐⢕⢕⢕⢕⢕⣕⢕⢕⠕⠁⢕⢕⢕⢕⢕⢕⢕⢕⠅⡄⢕⢕⢕⢕⢕⢕⢕⢕⢕
⢕⢕⢕⢕⢕⠅⢗⢕⠕⣠⠄⣗⢕⢕⠕⢕⢕⢕⠕⢠⣿⠐⢕⢕⢕⠑⢕⢕⠵⢕
⢕⢕⢕⢕⠁⢜⠕⢁⣴⣿⡇⢓⢕⢵⢐⢕⢕⠕⢁⣾⢿⣧⠑⢕⢕⠄⢑⢕⠅⢕
⢕⢕⠵⢁⠔⢁⣤⣤⣶⣶⣶⡐⣕⢽⠐⢕⠕⣡⣾⣶⣶⣶⣤⡁⢓⢕⠄⢑⢅⢑
⠍⣧⠄⣶⣾⣿⣿⣿⣿⣿⣿⣷⣔⢕⢄⢡⣾⣿⣿⣿⣿⣿⣿⣿⣦⡑⢕⢤⠱⢐
⢠⢕⠅⣾⣿⠋⢿⣿⣿⣿⠉⣿⣿⣷⣦⣶⣽⣿⣿⠈⣿⣿⣿⣿⠏⢹⣷⣷⡅⢐
⣔⢕⢥⢻⣿⡀⠈⠛⠛⠁⢠⣿⣿⣿⣿⣿⣿⣿⣿⡀⠈⠛⠛⠁⠄⣼⣿⣿⡇⢔
⢕⢕⢽⢸⢟⢟⢖⢖⢤⣶⡟⢻⣿⡿⠻⣿⣿⡟⢀⣿⣦⢤⢤⢔⢞⢿⢿⣿⠁⢕
⢕⢕⠅⣐⢕⢕⢕⢕⢕⣿⣿⡄⠛⢀⣦⠈⠛⢁⣼⣿⢗⢕⢕⢕⢕⢕⢕⡏⣘⢕
⢕⢕⠅⢓⣕⣕⣕⣕⣵⣿⣿⣿⣾⣿⣿⣿⣿⣿⣿⣿⣷⣕⢕⢕⢕⢕⡵⢀⢕⢕
⢑⢕⠃⡈⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⢃⢕⢕⢕
⣆⢕⠄⢱⣄⠛⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⢁⢕⢕⠕⢁
⣿⣦⡀⣿⣿⣷⣶⣬⣍⣛⣛⣛⡛⠿⠿⠿⠛⠛⢛⣛⣉⣭⣤⣂⢜⠕⢑⣡⣴⣿
*/
#include <bits/stdc++.h>

using namespace std;

typedef long long LL;
typedef long double LD;
#define MAX 100001
#define pi acos(-1)
#define whatis(x) cout << #x << " is " << x << "\n";
#define all(x) x.begin(), x.end()
#define show(x,i) for(auto i = x.begin(); i != x.end(); i++){cout << *i << " ";} cout << "\n";

void init(int node, int b, int e);
int query(int node, int b, int e, int i, int j);
void update(int node, int b, int e, int i, int newvalue);


int arr[MAX], tree[4*MAX];

void init(int node, int b, int e) // initializations
{
    if(b == e)
    {
        tree[node] = arr[b];
        return;
    }
    int left = 2*node;
    int right = left+1;
    int mid = (b+e)/2;
    init(left, b, mid);
    init(right, mid+1, e);
    tree[node] = tree[left]+tree[right];
}

int query(int node, int b, int e, int i, int j) // question
{
    if(i > e || j < b)
        return 0;
    if(b >= i && e <= j)
        return tree[node];
    int left = 2*node;
    int right = left+1;
    int mid = (b+e)/2;
    int ret1 = query(left, b, mid, i, j);
    int ret2 = query(right, mid+1, e, i, j);
    return ret1+ret2;
}

void update(int node, int b, int e, int i, int newvalue) // update
{
    if(i > e || i < b)
        return;
    if(b >= i && e <= i)
    {
        tree[node] = newvalue;
        return;
    }
    int left = 2*node;
    int right = left+1;
    int mid = (b+e)/2;
    update(left, b, mid, i, newvalue);
    update(right, mid+1, e, i, newvalue);
    tree[node] = tree[left] + tree[right];
}


int main()
{
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //cout.tie(NULL);

    return 0;
}