BZOJ1012 [JSOI2008]最大数maxnumber

暂时不知道别的，直接上了线段树

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <algorithm>
 4 using namespace std;
 5 #define lson l,m,rt<<1
 6 #define rson m+1,r,rt<<1|1
 7 const int maxn = 200005;
 8 int sum[maxn<<2];
 9 void pushup(int rt){
10     sum[rt] = max(sum[rt<<1],sum[rt<<1|1]);
11 }
12 void update(int pos,int val,int l,int r,int rt){
13     if(l==r){
14         sum[rt] = val;
15         return ;
16     }
17     int m = (l+r)>>1;
18     if(pos<=m)update(pos,val,lson);
19     else update(pos,val,rson);
20     pushup(rt);
21 }
22 int query(int L,int R,int l,int r,int rt){
23     if(L<=l&&r<=R)return sum[rt];
24     int m = (l+r)>>1,ans = -1;
25     if(L<=m)ans = max(ans,query(L,R,lson));
26     if(m<R)ans = max(ans,query(L,R,rson));
27     return ans;
28 }
29 int main()
30 {
31     int q,mod;
32     scanf("%d%d",&q,&mod);
33     memset(sum,-1,sizeof(sum));
34     int t =0,a,pos = 1;char s[2];
35     while(q--){
36         scanf("%s%d",s,&a);
37         if(s[0]=='A')update(pos++,(a+t)%mod,1,maxn-1,1);
38         else {
39             t = query(pos-a,maxn-1,1,maxn-1,1);
40             printf("%d\n",t);
41         }
42     }
43     return 0;
44 }

 

posted on 2015-08-03 15:45  round_0  阅读(125)  评论(0)  编辑  收藏  举报

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