Loj分块模板1

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<algorithm>
 
using namespace std;
 
int n, m, len;
int pos[5211314], add[5211314], num[5211314];
 
inline void Add(int LiftPos, int RightPos, int val) {
	int l = pos[LiftPos], r = pos[RightPos];
	if (l == r) {
		add[l] += val;
	}
	else {
		for (int i = l + 1; i <= r - 1; ++ i) 
			add[i] += val;
		for (int i = LiftPos; i <= l * len; ++ i) 
			num[i] += val;
		for (int i = (r - 1) * len + 1;i <= RightPos; ++ i) 
			num[i] += val;
	}
}
 
inline int Get(int id) {
	return num[id] + add[pos[id]];
}
 
inline int read() {
	int x = 0, f = 1;
	char ch = getchar();
	while (ch < '0' || ch > '9') {
		if (ch == '-') f = -1;
		ch = getchar();
	}
	while (ch >= '0' && ch <= '9') {
		x = (x << 1) + (x << 3) + (ch - '0');
		ch = getchar();
	}
	return x * f;
}
 
void write(int x) {
	if (x < 0) putchar('-'), x *= -1;
	if (x > 9) write(x / 10);
	putchar(x % 10 + '0');
	return;
}
 
int main() {
	n = read();
	m = read();
	len = sqrt(n);
	for (int i = 1; i <= n; ++ i) {
		num[i] = read();
		pos[i] = (i - 1) / len + 1;
	}
	for (int i = 1, opt, x, y, k; i <= m; ++ i) {
		opt = read();
		if (opt == 1) {
			x = read(), y = read(), k = read();
			Add(x, y, k);
		}
		if (opt == 2) {
			x = read();
			write(Get(x));
			putchar('\n');
		}
	}
	return 0;
}