[JSOI2008]最大数

 1 #include<cstdio>
 2 #include<cctype>
 3 #include<cstring>
 4 #include<algorithm>
 5 #define maxn 200000
 6 #define root 1
 7 #define _left <<1
 8 #define _right <<1|1
 9 char x;
10 int m,d,t=0,y,k=0;
11 inline char getupper() {
12     register char ch;
13     while(!isupper(ch=getchar()));
14     return ch;
15 }
16 inline int getint() {
17     register char ch;
18     while(!isdigit(ch=getchar()));
19     register int x=ch-‘0‘;
20     while(isdigit(ch=getchar())) x=x*10+ch-‘0‘;
21     return x;
22 }
23 struct SegmentTree {
24     int val[maxn<<2];
25     void initialize() {
26         for(int i=1;i<=m<<1;i++) val[i]=-0x80000000;
27     }
28     void push_up(const int p) {
29         val[p]=std::max(val[p _left],val[p _right]);
30     }
31     void modify(const int p,const int b,const int e,const int x,const int d) {
32         if(b==e) {
33             val[p]=d;
34             return;
35         }
36         int mid=(b+e)>>1;
37         if(x<=mid) {
38             modify(p _left,b,mid,x,d);
39         }
40         else {
41             modify(p _right,mid+1,e,x,d);
42         }
43         push_up(p);
44     }
45     int query(const int p,const int b,const int e,const int l,const int r) {
46         if((b==l)&&(e==r)) return val[p];
47         int max=-0x80000000,mid=(b+e)>>1;
48         if(l<=mid) max=std::max(max,query(p _left,b,mid,l,std::min(mid,r)));
49         if(r>mid) max=std::max(max,query(p _right,mid+1,e,std::max(mid+1,l),r));
50         return max;
51     }
52 };
53 SegmentTree tree;
54 int main() {
55     scanf("%d%d",&m,&d);
56     tree.initialize();
57     for(int i=1;i<=m;i++) {
58         x=getupper();
59         y=getint();
60         if(x==‘Q‘) {
61             printf("%d\n",t=tree.query(root,1,m,k-y+1,k));
62         }
63         else {
64             tree.modify(root,1,m,++k,(y+t)%d);
65         }
66     }
67     return 0;
68 }