hdu1166 單點修改區間查詢

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<algorithm>
#include<cstring>
#include<string.h>
#include<cstdio>
using namespace std;

const int maxn = 50005;
int sum[maxn<<2];

void push_up(int root)
{
	sum[root] = sum[root << 1] + sum[((root << 1) | 1)];
}

void build(int L, int R, int root)
{
	if (L == R) {
		scanf("%d", &sum[root]);
		return;
	}
	int mid = (L + R) >> 1;
	build(L, mid, root << 1);
	build(mid + 1, R, ((root << 1) | 1));
	push_up(root);
}

void push_down(int a, int value, int L, int R, int root)
{
	if (L == R) {
		sum[root] += value;
		return;
	}
	int mid = (L + R) >> 1;
	if (a <= mid)push_down(a, value, L, mid, root << 1);
	else push_down(a, value, mid + 1, R, ((root << 1) | 1));
	push_up(root);
}


int query(int l, int r, int L, int R, int root)
{
	if (l <= L&&r >= R)return sum[root];
	int mid = (L + R) >> 1;
	if (r <= mid)return query(l, r, L, mid, root << 1);
	else if (l > mid)return query(l, r, mid + 1, R, ((root << 1) | 1));
	else return query(l, mid, L, mid, root << 1) + query(mid + 1, r, mid + 1, R, ((root << 1) | 1));
}


int main()
{
	int T,n;
	scanf("%d", &T);
	for (int i = 1; i <= T; i++) {
		scanf("%d", &n);
		build(1, n, 1);
		printf("Case %d:\n", i);
		char ch[20];
		while (scanf("%s",ch))
		{
			if (ch[0] == 'E')break;
			int a, b;
			cin >> a >> b;
			if (ch[0] == 'A')push_down(a, b, 1, n, 1);
			else if (ch[0] == 'S')push_down(a, -b, 1, n, 1);
			else if (ch[0] == 'Q')
				printf("%d\n", query(a, b, 1, n, 1));
		}
	}
	return 0;
}