CodeForces 705C Thor

开30W个vector将数字归类，每一类数字开一个指针P，记录已经阅读到哪一个了，还可以开一个优先队列维护这些指针P。

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<iostream>
using namespace std;
typedef long long LL;
const double pi=acos(-1.0),eps=1e-8;
void File()
{
    freopen("D:\\in.txt","r",stdin);
    freopen("D:\\out.txt","w",stdout);
}
inline int read()
{
    char c = getchar();  while(!isdigit(c)) c = getchar();
    int x = 0;
    while(isdigit(c)) { x = x * 10 + c - '0'; c = getchar(); }
    return x;
}

const int maxn=300000+10;
vector<int>g[maxn];
int n,q,sz,p[maxn],ans;

struct X
{
    int num,now,pos,idx;
    bool operator < (const X &a) const {
        return idx>a.idx;
    }
    X(int Num,int Now,int Pos,int Idx) {num=Num; now=Now; pos=Pos,idx=Idx;}
};
priority_queue<X>Q;

int main()
{
    scanf("%d%d",&n,&q);
    sz=0; ans=0; memset(p,-1,sizeof p);
    for(int i=1;i<=q;i++)
    {
        int t,d; scanf("%d%d",&t,&d);
        if(t==1)
        {
            ++sz;
            if(p[d]==g[d].size()-1)
            {
                Q.push(X(d,p[d],p[d]+1,sz));
            }g[d].push_back(sz); ans++;
        }
        else if(t==2)
        {
            ans=ans-(g[d].size()-1-p[d]);
            p[d]=g[d].size()-1;
        }
        else
        {
            while(!Q.empty()&&Q.top().idx<=d)
            {
                X h=Q.top(); Q.pop();
                if(h.now<p[h.num]) continue;
                ans=ans-(h.pos-p[h.num]);
                p[h.num]=h.pos;
                if(p[h.num]+1<g[h.num].size())
                    Q.push(X(h.num,p[h.num],p[h.num]+1,g[h.num][p[h.num]+1]));
            }
        }
        printf("%d\n",ans);
    }
    return 0;
}