bzoj1012: [JSOI2008]最大数maxnumber

题目链接

bzoj1012: [JSOI2008]最大数maxnumber

题解

维护一颗长m序列的线段树
瞎打就OK了
听说可以单调栈？
luogu数据真是有毒

代码

#include<cstdio>
#include<algorithm> 
const int maxn = 200007; 
inline int read() { 
    int x = 0,f = 1;
    char c = getchar(); 
    while(c < '0' || c > '9') {if(c == '-')f = -1;c = getchar();} 
    while(c <= '9' && c >= '0')x = x * 10 + c - '0',c = getchar(); 
    return x * f; 
} 
int t[maxn << 2]; 
int D,M,len; 
#define ls x << 1
#define rs x << 1 | 1 
inline void update(int x) {
    t[x] = std::max(t[ls],t[rs]); 
}
void modify(int x,int l,int r,int to,int w) { 
    if(l == r) {
        t[x] = w % M; return ;
    } 
    int mid = l + r >> 1;
    if(to <= mid) modify(ls,l,mid,to,w); 
    else modify(rs,mid + 1,r,to,w) ; 
    return update(x); 
} 
int query(int x,int l,int r,int tl,int tr) {
    if(l >= tl && r <= tr) 
        return t[x]; 
    int mid = l + r >> 1;
    int ret = 0;
    if(tl <= mid) ret = std::max(ret,query(ls,l,mid,tl,tr)); 
    if(tr > mid ) ret = std::max(ret,query(rs,mid + 1,r,tl,tr)); 
    return ret; 
}
int main() { 
    D = read(),M = read(); 
    char c[20]; 
    len = 0;
    for(int tmp = 0,k,i = 1;i <= D;++ i) { 
        scanf("%s",c + 1) ;
        if(c[1] == 'A') {
            len ++;k = read(); 
            modify(1,1,D,len,k + tmp);  
        } 
        else {
            k = read(); 
            tmp = query(1,1,D,len - k + 1,len) % M; 
            printf("%d\n",tmp % M); 
        } 
    }
    return 0; 
}