沙僧 思路: dfs序+差分数组 分层考虑,通过dfs序来查找修改的区间段,然后用差分数组修改 代码: #include<bits/stdc++.h> using namespace std; #define fi first #define se second #define pi acos(-1.0) #define LL long long #define mp make_pair #define pb push_back #define ls rt<<1, l, m #de…
Problem A: An easy problem Description Peter Manson owned a small house in an obscure street. It was a weather-beaten tenement of wood, containing some six or eight rooms, all of which, with one exception, were given over to dirt, cobwebs, gloom, and…