?傳送門 ?
debug到死2333.
雖然說是splay維護序列模板，作為蒟蒻的我還是GG
%%%考場A的dalao Orz ?Orz.
其實不開long long也行，inf開成0x3f3f3f3f也可（flag,歡迎推翻）
就當存個板子吧.
#include<bits/stdc++.h> #include<cstdio> #include<cmath> #include<cstring> #include<cstdlib> #include<algorithm> #include<queue> #include<deque> #include<list> #include<set> #include<vector> #include<iostream> #define ll long long #define re register #define inf 0x7f7f7f7f #define inl inline #define sqr(x) (x*x) #define max(a,b) (a>b?a:b) //#define eps 1e-8 #define debug puts("**************************"); //#pragma comment(linker, "/STACK:1024000000,1024000000") //#pragma GCC optimize (2) //#pragma G++ optimize (2) using namespace std; //const ll mod; const ll MAXN=1e6+10; inl ll read() {re ll x = 0; re int f = 1;char ch = getchar();while(ch<'0'||ch>'9') { if(ch== '-' ) f = -1; ch = getchar(); }while(ch>='0'&&ch<='9') {x=(x<<1)+(x<<3)+(ch^48);ch=getchar();}return x * f; } inl char readc() {char ch=getchar();while(('z'<ch||ch<'a')&&('Z'<ch||ch<'A')) ch=getchar();return ch; } inl void write(re ll x){if(x>=10)write(x/10);putchar(x%10+'0'); } inl void writeln(re ll x){if(x<0) {x=-x;putchar('-');}write(x); puts(""); } inl ll gcd(re ll x,re ll y){while(y^=x^=y^=x%=y);return x;} inl ll Lcm(re ll a,re ll b) {return a/gcd(a,b)*b;} inl void FR() {freopen(".in","r",stdin);freopen(".out","w",stdout); } inl void FC() {fclose(stdin);fclose(stdout); } ll root,id[MAXN],cnt; struct Node {ll fa,son[2],sumx,val,siz,maxx,lx,rx;bool rev,flag;void clear() {fa=son[0]=son[1]=sumx=val=siz=maxx=lx=rx=rev=flag=0;} }Tree[MAXN]; ll dir(ll x) {return Tree[Tree[x].fa].son[1]==x;} inl void pushup(ll x) {re ll l=Tree[x].son[0],r=Tree[x].son[1];Tree[x].siz=Tree[l].siz+Tree[r].siz+1;Tree[x].sumx=Tree[l].sumx+Tree[r].sumx+Tree[x].val;Tree[x].maxx=max(Tree[r].maxx,Tree[l].maxx);Tree[x].maxx=max(Tree[x].maxx,Tree[l].rx+Tree[r].lx+Tree[x].val);Tree[x].lx=max(Tree[l].lx,Tree[l].sumx+Tree[x].val+Tree[r].lx);Tree[x].rx=max(Tree[r].rx,Tree[r].sumx+Tree[x].val+Tree[l].rx); } inl void pushdown(ll x) {re ll l=Tree[x].son[0],r=Tree[x].son[1];if(Tree[x].flag) {Tree[x].flag=Tree[x].rev=0;if(l) Tree[l].val=Tree[x].val,Tree[l].sumx=Tree[l].val*Tree[l].siz,Tree[l].flag=1;if(r) Tree[r].val=Tree[x].val,Tree[r].sumx=Tree[r].val*Tree[r].siz,Tree[r].flag=1;if(Tree[x].val>=0) {if(l) Tree[l].lx=Tree[l].rx=Tree[l].maxx=Tree[l].sumx;if(r) Tree[r].lx=Tree[r].rx=Tree[r].maxx=Tree[r].sumx;}else {if(l) Tree[l].lx=Tree[l].rx=0,Tree[l].maxx=Tree[l].val;if(r) Tree[r].lx=Tree[r].rx=0,Tree[r].maxx=Tree[r].val;}}if(Tree[x].rev) {Tree[x].rev=0;Tree[l].rev^=1;Tree[r].rev^=1;swap(Tree[l].lx,Tree[l].rx);swap(Tree[r].lx,Tree[r].rx);swap(Tree[l].son[0],Tree[l].son[1]);swap(Tree[r].son[0],Tree[r].son[1]);} } inl void rotate(ll x) {re ll y=Tree[x].fa,z=Tree[y].fa,o=dir(x);re ll so=dir(y);Tree[y].son[o]=Tree[x].son[o^1];Tree[Tree[y].son[o]].fa=y;Tree[x].son[o^1]=y;Tree[y].fa=x;Tree[z].son[so]=x;Tree[x].fa=z;pushup(y);pushup(x); } inl void splay(ll x,ll goal) {for(re ll y;(y=Tree[x].fa)!=goal;rotate(x)) {if(Tree[y].fa!=goal) rotate(dir(y)==dir(x)?y:x);}if(!goal) root=x; } inl ll find(ll x,ll rk) {pushdown(x);re ll l=Tree[x].son[0],r=Tree[x].son[1];if(Tree[l].siz+1==rk) return x;else if(Tree[l].siz>=rk) return find(l,rk);else return find(r,rk-Tree[l].siz-1); } ll s[MAXN]; inl ll build(ll l,ll r,ll fro) {re ll mid=(l+r)>>1,t=id[mid];Tree[t].clear();Tree[t].val=s[mid];Tree[t].fa=fro;if(l==r) {Tree[t].lx=Tree[t].rx=max(0,Tree[t].val);Tree[t].maxx=Tree[t].sumx=Tree[t].val;Tree[t].son[0]=Tree[t].son[1]=0;Tree[t].siz=1;return t;}if(l<mid) Tree[t].son[0]=build(l,mid-1,t);else Tree[t].son[0]=0;if(mid<r) Tree[t].son[1]=build(mid+1,r,t);else Tree[t].son[1]=0;pushup(t);return t; } char ss[20]; queue<ll>Q; inl void insert(ll pos,ll tot) {for(re ll i=1;i<=tot;i++) s[i]=read();for(re ll i=1;i<=tot;i++) {if(!Q.empty()) id[i]=Q.front(),Q.pop();else id[i]=++cnt;}re ll l=find(root,pos+1),r=find(root,pos+2);splay(l,0);splay(r,l);Tree[r].son[0]=build(1,tot,r);pushup(r);pushup(l); } inl void recycle(ll x) {re ll &l=Tree[x].son[0],&r=Tree[x].son[1];if(l) recycle(l);if(r) recycle(r);Q.push(x);Tree[x].clear();l=r=0; } inl ll split(ll pos,ll tot) {re ll x=find(root,pos),y=find(root,pos+tot+1);splay(x,0);splay(y,x);return Tree[y].son[0]; } inl void del(ll pos,ll tot) {re ll x=split(pos,tot),y=Tree[x].fa;recycle(x);Tree[y].son[0]=0;pushup(y);pushup(Tree[y].fa); } inl void modify(ll pos,ll tot,ll val) {re ll x=split(pos,tot),y=Tree[x].fa;Tree[x].flag=1;Tree[x].val=val,Tree[x].sumx=Tree[x].siz*Tree[x].val;if(Tree[x].val>=0) Tree[x].lx=Tree[x].rx=Tree[x].maxx=Tree[x].sumx;else Tree[x].lx=Tree[x].rx=0,Tree[x].maxx=Tree[x].val;pushup(y);pushup(Tree[y].fa); } inl void rever(ll pos,ll tot) {re ll x=split(pos,tot),y=Tree[x].fa;if(!Tree[x].flag) {Tree[x].rev^=1;swap(Tree[x].lx,Tree[x].rx);swap(Tree[x].son[0],Tree[x].son[1]);pushup(y);pushup(Tree[y].fa);} } inl ll query(ll pos,ll tot) {re ll x=split(pos,tot);return Tree[x].sumx; } int main() { // FR();re ll n=read(),m=read();for(re ll i=1;i<=n;i++) {s[i+1]=read();}Tree[0].maxx=s[1]=s[n+2]=-inf;cnt=n+2;for(re ll i=1;i<=n+2;i++) id[i]=i;root=build(1,n+2,0);for(re ll i=1;i<=m;i++) {scanf("%s",ss);if(ss[0]=='I') {re ll pos=read(),tot=read();insert(pos,tot);}else if(ss[0]=='D') {re ll pos=read(),tot=read();del(pos,tot);}else if(ss[0]=='M') {if(ss[2]=='X') writeln(Tree[root].maxx);else {re ll pos=read(),tot=read(),val=read();modify(pos,tot,val);}}else if(ss[0]=='R') {re ll pos=read(),tot=read();rever(pos,tot);}else if(ss[0]=='G') {re ll pos=read(),tot=read();writeln(query(pos,tot));}} // FC();return 0; }
?
