Problem:
Range Add Query (RAQ)

Write a program which manipulates a sequence A = {a1, a2, . . . , an} with the following operations:

add(s, t, x): add x to as, as+1, ..., at.

get(i): output the value of ai.

Note that the initial values of ai (i = 1, 2, . . . , n) are 0.

Input

n q
query1
query2
:
queryq

In the first line, n (the number of elements in A) and q (the number of queries) are given. Then, ith query queryi is given in the following format:

0 s t x

or

1 t

The first digit represents the type of the query. '0' denotes add(s, t, x) and '1' denotes get(i).

Output

For each get operation, print the value.

Constraints

1 ≤ n ≤ 100000

1 ≤ q ≤ 100000

1 ≤ s ≤ t ≤ n

1 ≤ i ≤ n

0 ≤ x ≤ 1000

Sample Input 1

3 5
0 1 2 1
0 2 3 2
0 3 3 3
1 2
1 3

Sample Output 1

3
5

Sample Input 2

4 3
1 2
0 1 4 1
1 2

Sample Output 2

0
1

Solution in C++14 (judge verdict: Accepted)

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

int tree[100010];
int n;
//BIT
int sum(int k){
    int s=0;
    while(k<=n){
        s+=tree[k];
        k+=(k&-k);
    }
    return s;
}
    
void add(int k, int x){
    while(k>0){
        tree[k]+=x;
        k-=(k&-k);
    }
}

int main(void){
    int q, a, s, t, x;
    cin >> n >> q;
    while(q--){
        cin >> a;
        if(a==0){
            cin >> s >> t >> x;
            add(t, x);
            add(s-1, -x);
        }else{
            cin >> s;
            cout << sum(s) << "\n";
        }
    }
    return 0;
    
}