题意：中文题。
解题思路：splay
解题代码：
1 // File Name: hdu1166.cpp
2 // Author: darkdream
3 // Created Time: 2015年04月02日 星期四 18时21分48秒
4
5 #include<vector>
6 #include<list>
7 #include<map>
8 #include<set>
9 #include<deque>
10 #include<stack>
11 #include<bitset>
12 #include<algorithm>
13 #include<functional>
14 #include<numeric>
15 #include<utility>
16 #include<sstream>
17 #include<iostream>
18 #include<iomanip>
19 #include<cstdio>
20 #include<cmath>
21 #include<cstdlib>
22 #include<cstring>
23 #include<ctime>
24 #define LL long long
25
26 using namespace std;
27 const int maxn = 50005;
28 int t,n;
29 struct SplayTree{
30 int sz[maxn];
31 int ch[maxn][2];
32 int pre[maxn];
33 int root ,top1,top2;
34 int ss[maxn],que[maxn];
35
36 inline void Rotate(int x,int f){
37 int y = pre[x];
38 push_down(y);
39 push_down(x);
40 ch[y][!f] = ch[x][f];
41 pre[ch[x][f]] = y ;
42 pre[x] = pre[y];
43 if(pre[x]) ch[pre[y]][ch[pre[y]][1] == y] = x;
44 ch[x][f] = y ;
45 pre[y] = x ;
46 push_up(y);
47 }
48 inline void Splay(int x, int goal){
49 push_down(x);
50 while(pre[x] != goal){
51 if(pre[pre[x]] == goal){
52 Rotate(x, ch[pre[x]][0] == x);
53 }else{
54 int y = pre[x],z = pre[y];
55 int f = (ch[z][0] == y);
56 if(ch[y][f] == x){
57 Rotate(x,!f) , Rotate(x,f);
58 }else{
59 Rotate(y,f) , Rotate(x,f);
60 }
61 }
62 }
63 push_up(x);
64 if(goal == 0) root = x;
65 }
66 inline void RotateTo(int k ,int goal){
67 int x = root;
68 push_down(x);
69 while(sz[ch[x][0]] != k ){
70 if(k < sz[ ch[x][0] ]){
71 x = ch[x][0];
72 }else{
73 k -= (sz[ch[x][0]] + 1);
74 x = ch[x][1];
75 }
76 push_down(x);
77 }
78 Splay(x,goal);
79 }
80 inline void erase(int x){
81 int father = pre[x];
82 int head = 0 , tail = 0 ;
83 for(que[tail ++] = x ; head < tail ;head ++){
84 ss[top2++] = que[head];
85 if(ch[que[head] ][0]) que[tail ++] = ch[que[head]][0];
86 if(ch[que[head] ][1]) que[tail ++] = ch[que[head]][1];
87 }
88 ch[father][ch[father][1] == x] = 0 ;
89 push_up(father);
90 }
91 inline void NewNode(int &x,int c){
92 if(top2) x = ss[--top2];
93 else x = ++top1;
94 ch[x][0] = ch[x][1] = pre[x] = 0 ;
95 sz[x] = 1;
96 val[x] = sum[x] = c;
97 }
98 inline void push_down(int x){
99
100 }
101 inline void push_up(int x){
102 sz[x] = 1 + sz[ch[x][0]] + sz[ch[x][1]];
103 sum[x] = val[x] + sum[ch[x][0]] + sum[ch[x][1]];
104 }
105 inline void makeTree(int &x,int l ,int r,int f){
106 if(l > r) return ;
107 int m = (l + r ) >> 1;
108 NewNode(x,num[m]);
109 makeTree(ch[x][0],l,m-1,x);
110 makeTree(ch[x][1],m+1,r,x);
111 pre[x] = f;
112 push_up(x);
113 }
114 inline void init(int n){
115 ch[0][0] = ch[0][1] = pre[0] = sz[0] = 0 ;
116 sum[0] = 0 ;
117 root = top1 = 0 ;
118 NewNode(root,-1);
119 NewNode(ch[root][1],-1);
120 pre[top1] = root;
121 sz[root] = 2;
122
123 for(int i = 1 ;i <= n;i ++) scanf("%d",&num[i]);
124 makeTree(ch[ch[root][1]][0],1,n,ch[root][1]);
125 push_up(ch[root][1]);
126 push_up(root);
127
128 }
129 inline void update(int l,int v){
130 RotateTo(l,0);
131 val[root] += v;
132 }
133 inline void query(int l , int r){
134 RotateTo(l-1,0);
135 RotateTo(r+1,root);
136 printf("%lld\n",sum[ch[ch[root][1]][0]]);
137 }
138 int num[maxn];
139 LL sum[maxn];
140 int val[maxn];
141 }spt;
142 char str[10];
143 int ta,tb;
144 int main(){
145 scanf("%d",&t);
146 for(int CA = 1; CA <= t ; CA ++)
147 {
148 printf("Case %d:\n",CA);
149 scanf("%d",&n);
150 spt.init(n);
151 while(scanf("%s",str)!= EOF)
152 {
153 if(str[0] == ‘E‘)
154 break;
155 scanf("%d %d",&ta,&tb);
156 if(str[0] == ‘Q‘)
157 {
158 spt.query(ta,tb);
159 }else if(str[0] == ‘A‘){
160 spt.update(ta,tb);
161 }else if(str[0] == ‘S‘){
162 spt.update(ta,-tb);
163 }else {
164 break;
165 }
166 //printf("%lld\n",spt.sum[1]);
167 }
168 }
169
170 return 0;
171 }
时间： 2024-08-15 01:13:12