BZOJ 1012

Posted 2020-10-23 殇雪

题链

一道线段树。看代码吧

#pragma GCC optimize("-O2")
#include<bits/stdc++.h>
//#define getchar nc
#define sight(c) (‘0‘<=c&&c<=‘9‘)
#define siight(c) (‘A‘<=c&&c<=‘Z‘) 
#define LL long long
#define deg printf
#define dput put
#define dputc putchar
#define db double 
#define N 200007
#define eho(x) for(int i=head[x];i;i=net[i])
inline char nc(){
    static char buf[1000000],*p1=buf,*p2=buf;
    return p1==p2&&(p2=(p1=buf)+fread(buf,1,1000000,stdin),p1==p2)?EOF:*p1++;
}
inline void read(int &x){
    static char c;
    for (c=getchar();!sight(c);c=getchar());
    for (x=0;sight(c);c=getchar())x=x*10+c-48;
}
inline void readC(char &x){
    for (x=getchar();!siight(x);x=getchar());
}
void write(int x){if (x<10) {putchar(‘0‘+x); return;} write(x/10); putchar(‘0‘+x%10);}
inline void writeln(int x){ if (x<0) putchar(‘-‘),x*=-1; write(x); putchar(‘\n‘); }
using namespace std;
int p[N<<2|N],n,mo,x,lastans,tot;
#define Mid (l+r>>1)
char ch;
void change(int node,int l,int r,int op,int dal){
    if (l==r) { p[node]=dal;return;}
    if (op<=Mid) change(node<<1,l,Mid,op,dal);
    else change(node<<1|1,Mid+1,r,op,dal);
    p[node]=max(p[node<<1],p[node<<1|1]);
}
int query(int node,int l,int r,int L,int R){
    if (L<=l&&r<=R) return p[node];
    if (R<=Mid) return query(node<<1,l,Mid,L,R);
    if (L> Mid) return query(node<<1|1,Mid+1,r,L,R);
    return max(query(node<<1,l,Mid,L,Mid),query(node<<1|1,Mid+1,r,Mid+1,R));
}
int main () {
//    freopen("1.in","r",stdin);
    read(n); read(mo);
    while (n--) {
        readC(ch); read(x);
        if (ch==‘A‘) {
            x=(1ll*x+lastans)%mo,change(1,1,N,++tot,x);
        } else {
            lastans=query(1,1,N,tot-x+1,tot),
            writeln(lastans);
        }
    } return 0;
}