CodeForces - 1208E

CodeForces - 1208E
经典滑动窗口问题，如果以物体为参考系的话。
前缀和优化区间操作

#include <bits/stdc++.h>
#define inf 2333333333333333
#define N 1000010
#define p(a) putchar(a)
#define For(i,a,b) for(long long i=a;i<=b;++i)
//by war
//2020.8.4
using namespace std;
long long n,m,len,l,r,k,tmp;
long long a[N],q[N],L[N],R[N],sum[N];
void in(long long &x){
    long long y=1;char c=getchar();x=0;
    while(c<'0'||c>'9'){if(c=='-')y=-1;c=getchar();}
    while(c<='9'&&c>='0'){ x=(x<<1)+(x<<3)+c-'0';c=getchar();}
    x*=y;
}
void o(long long x){
    if(x<0){p('-');x=-x;}
    if(x>9)o(x/10);
    p(x%10+'0');
}

signed main(){
    in(n);in(m);
    For(i,1,n){
        in(len);
        For(j,1,len) in(a[j]);
        L[0]=-1e10;
        For(j,1,len) L[j]=max(L[j-1],a[j]);
        R[len+1]=-1e10;
        for(long long j=len;j;j--) R[j]=max(R[j+1],a[j]);
        k=m-len;
        if(k>=len-1){
            l=len;r=m-len+1;
            if(l!=r) L[len]=max(L[len],(long long)0);
            sum[l]+=L[len];
            sum[r+1]-=L[len];
            For(j,1,l-1){
                sum[j]+=max(L[j],(long long)0);
                sum[j+1]-=max(L[j],(long long)0);
            }
            For(j,r+1,m){
                sum[j]+=max(R[j-r+1],(long long)0);
                sum[j+1]-=max(R[j-r+1],(long long)0);
            }
        }else{
            l=1;r=0;
            For(j,1,len){
                while(l<=r && q[r]-q[l]>=k) q[l++]=0;
                while(l<=r && a[j]>=a[q[r]]) r--;
                q[++r]=j;
                tmp=a[q[l]];
                if(j<=k) tmp=max(tmp,(long long)0);
                sum[j]+=tmp;
                sum[j+1]-=tmp;
            }
            For(j,l,r) q[j]=0;
            For(j,len+1,m){
                sum[j]+=max(R[j+len-m],(long long)0);
                sum[j+1]-=max(R[j+len-m],(long long)0);
            }
        }
    }
    For(i,1,m){
        sum[i]+=sum[i-1];
        o(sum[i]);p(' ');
    }
    return 0;
}