To The Moon is a independent game released in November 2011, it is a role-playing adventure game powered by RPG Maker.
The PRemise of To The Moon is based around a technology that allows us to permanently reconstruct the memory on dying man. In this problem, we'll give you a chance, to implement the logic behind the scene.
You‘ve been given N integers A[1], A[2],..., A[N]. On these integers, you need to implement the following Operations:
C l r d: Adding a constant d for every {Ai | l <= i <= r}, and increase the timestamp by 1, this is the only operation that will cause the timestamp increase. Q l r: Querying the current sum of {Ai | l <= i <= r}.H l r t: Querying a history sum of {Ai | l <= i <= r} in time t.B t: Back to time t. And once you decide return to a past, you can never be access to a forward edition anymore... N, M ≤ 10^5, |A[i]| ≤ 10^9, 1 ≤ l ≤ r ≤ N, |d| ≤ 10^4 .. the system start from time 0, and the first modification is in time 1, t ≥ 0, and won't introduce you to a future state.
n mA1 A2 ... An... (here following the m operations. )Output
... (for each query, simply print the result. )Example
Input 1:10 51 2 3 4 5 6 7 8 9 10Q 4 4Q 1 10Q 2 4C 3 6 3Q 2 4Output 1:455915Input 2:2 40 0C 1 1 1C 2 2 -1Q 1 2H 1 2 1Output 2:01 Submit solution!题意:
一个长度为n的数组,4种操作 :
(1)C l r d:区间[l,r]中的数都加1,同时当前的时间戳加1 。
(2)Q l r:查询当前时间戳区间[l,r]中所有数的和 。
(3)H l r t:查询时间戳t区间[l,r]的和 。
(4)B t:将当前时间戳置为t 。时间倒转后就不能再回去。
所有操作均合法 。
题解:
以前写的那几个主席树的题都是属于主席树的应用-查询第k大之类的。
这个题就是主席树的最初用途了。
发现以前写的用于查询第k大的主席树模版写这种题似乎不太合适==
于是换了一种大众一点的写法,可以当作板子。
#include<iostream>#include<cstdio>#include<algorithm>#include<cstring>#include<vector>#include<queue>#include<stack>using namespace std;#define rep(i,a,n) for (int i=a;i<n;i++)#define per(i,a,n) for (int i=n-1;i>=a;i--)#define pb push_back#define fi first#define se secondtypedef vector<int> VI;typedef long long ll;typedef pair<int,int> PII;const int maxn=1e6+100;struct node{ int l,r,mark; ll sum,tag;}T[maxn*40];int root[maxn];int cnt;//void pushup(int x){ T[x].sum=T[T[x].l].sum+T[T[x].r].sum;}int build(int l,int r){ int root=++cnt; T[root].sum=T[root].tag=T[root].mark=0; if(l==r) { scanf("%lld",&T[root].sum); T[root].l=T[root].r=0; return root; } int m=(l+r)/2; T[root].l=build(l,m); T[root].r=build(m+1,r); pushup(root); return root;}void copy(int x,int y){ T[x].sum=T[y].sum; T[x].tag=T[y].tag; T[x].l=T[y].l; T[x].r=T[y].r;}void pushdown(int x,int l,int r){ if(T[x].mark)// { int now=++cnt; copy(now,T[x].l); T[x].l=now; now=++cnt; copy(now,T[x].r); T[x].r=now; T[T[x].l].mark=T[T[x].r].mark=1; // T[x].mark=0; } if(T[x].tag) { int m=(l+r)/2; T[T[x].l].tag+=T[x].tag; T[T[x].r].tag+=T[x].tag; T[T[x].l].sum+=1ll*T[x].tag*(m-l+1); T[T[x].r].sum+=1ll*T[x].tag*(r-m); T[x].tag=0; }}int update(int root,int L,int R,int l,int r,int v){ int now=++cnt; if(l==L&&r==R) { T[now].l=T[root].l; T[now].r=T[root].r; // T[now].sum=T[root].sum+1ll*(r-l+1)*v; T[now].tag=T[root].tag+v; T[now].mark=l==r?0:1; return now; } int m=(L+R)/2; T[now].mark=T[now].sum=T[now].tag=0;// pushdown(root,L,R); if(r<=m) { T[now].l=update(T[root].l,L,m,l,r,v); T[now].r=T[root].r; } else if(l>m) { T[now].l=T[root].l; T[now].r=update(T[root].r,m+1,R,l,r,v); } else { T[now].l=update(T[root].l,L,m,l,m,v); T[now].r=update(T[root].r,m+1,R,m+1,r,v); } pushup(now); return now;}ll query(int root,int L,int R,int l,int r){ if(L==l&&R==r) return T[root].sum; pushdown(root,L,R); // int m=(L+R)/2; if(r<=m) return query(T[root].l,L,m,l,r); else if(l>m) return query(T[root].r,m+1,R,l,r); else return query(T[root].l,L,m,l,m)+query(T[root].r,m+1,R,m+1,r);}int main(){ int n,m; while(~scanf("%d%d",&n,&m)) { int now=0; cnt=0; root[now]=build(1,n); char op[5]; while(m--) { scanf("%s",op); int l,r,v; if(op[0]=='Q') { scanf("%d%d",&l,&r); printf("%lld/n",query(root[now],1,n,l,r)); } else if(op[0]=='C') { scanf("%d%d%d",&l,&r,&v); now++; root[now]=update(root[now-1],1,n,l,r,v); } else if(op[0]=='H') { scanf("%d%d%d",&l,&r,&v); printf("%lld/n",query(root[v],1,n,l,r)); } else if(op[0]=='B') scanf("%d",&v),now=v; } puts(""); } return 0;}
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