QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#18946 | #1877. Matryoshka Dolls | wlzhouzhuan | RE | 0ms | 0kb | C++17 | 4.4kb | 2022-01-27 17:14:38 | 2022-05-06 03:22:41 |
Judging History
answer
// Author: wlzhouzhuan
#pragma GCC optimize(2)
#include<bits/stdc++.h>
using namespace std;
#define rep(i,l,r) for(int i=(l);i<=(r);i++)
#define per(i,l,r) for(int i=(l);i>=(r);i--)
#define ll long long
#define ull unsigned long long
#define pii pair<int,int>
#define mset(s,t) memset(s,t,sizeof(s))
#define mcpy(s,t) memcpy(s,t,sizeof(t))
#define SZ(x) ((int)x.size())
#define pb push_back
#define eb emplace_back
#define fir first
#define sec second
template<class T1,class T2>void ckmax(T1 &a,T2 b){if(a<b)a=b;}
template<class T1,class T2>void ckmin(T1 &a,T2 b){if(a>b)a=b;}
namespace IO {
const int SIZE = 1 << 16;
char ibuf[SIZE]; int iS, iT;
char obuf[SIZE]; int oT;
inline char gc() {
if (iS == iT)
iS = 0, iT = fread(ibuf, 1, SIZE, stdin);
return iS == iT ? EOF : ibuf[iS++];
}
inline void pc(char c) {
obuf[oT++] = c;
if (oT == SIZE)
fwrite(obuf, 1, SIZE, stdout), oT = 0;
}
inline int read() {
int x = 0, f = 0;
char c = gc();
while (!isdigit(c)) f |= c == '-', c = gc();
while (isdigit(c)) x = 10 * x + c - '0', c = gc();
return f ? -x : x;
}
inline void print(int64_t x) {
static char bufn[64];
int len = 0;
if (x < 0) x = -x, pc('-');
while (x >= 10) bufn[len++] = x % 10 + '0', x /= 10;
bufn[len++] = x + '0';
while (len--) pc(bufn[len]);
}
inline void print(int64_t x, char ch) {
print(x), pc(ch);
}
struct ff {
~ff() {
if (oT)
fwrite(obuf, 1, oT, stdout);
}
} flusher;
}
using namespace IO;
const int N=5000005;
int n,m,be[N],a[N],pos[N],B;
struct Q{
int l,r,id;
friend bool operator < (const Q&a,const Q&b){
return be[a.l]^be[b.l]?a.l<b.l:a.r>b.r;
}
}q[N];
struct UNDO{
int who,l,r;
}rec[N];
int rlen;
int tmpL[N],tmpR[N];
int L[N],R[N];
ll ANS[N];
pii brute[N];int blen;
ll BRUTE(int l,int r){
ll ans=0;int las=0;
rep(i,1,blen){
if(brute[i].sec>=l&&brute[i].sec<=r){
if(las)ans+=abs(las-brute[i].sec);
las=brute[i].sec;
}
}
return ans;
}
int main(){
freopen("rrads.in","r",stdin);
freopen("rrads.out","w",stdout);
n=read(),m=read(),B=max(1,(int)(n/sqrt(m)));
rep(i,1,n)a[i]=read(),pos[a[i]]=i,be[i]=(i-1)/B+1;
rep(i,1,m)q[i].l=read(),q[i].r=read(),q[i].id=i;
sort(q+1,q+m+1);
int j=1;ll ans=0;
rep(i,1,n){
L[pos[i]]=pos[i-1],R[pos[i]]=pos[i+1];
if(i<n)ans+=abs(pos[i]-pos[i+1]);
}
for(int l=1,r=B,zz=1;l<=n;l+=B,r+=B,zz++){
ckmin(r,n);
blen=0;rep(i,l,r)brute[++blen]={a[i],i};sort(brute+1,brute+blen+1);
ll qaqans=ans;
int cur=n;
rep(i,1,n)tmpL[i]=L[i],tmpR[i]=R[i];
while(j<=m&&be[q[j].l]==zz){
if(be[q[j].r]==zz){
ANS[q[j].id]=BRUTE(q[j].l,q[j].r);
j++;
continue;
}
while(cur>q[j].r){
// del val
bool ok1=L[cur],ok2=R[cur];
if(ok1)ans-=abs(L[cur]-cur);
if(ok2)ans-=abs(R[cur]-cur);
if(ok1&&ok2)ans+=abs(L[cur]-R[cur]);
R[L[cur]]=R[cur],L[R[cur]]=L[cur],cur--;
}
ll tmpans=ans;
rep(cur,l,q[j].l-1){
// del
bool ok1=L[cur],ok2=R[cur];
if(ok1)ans-=abs(L[cur]-cur);
if(ok2)ans-=abs(R[cur]-cur);
if(ok1&&ok2)ans+=abs(L[cur]-R[cur]);
rec[++rlen]={cur,L[cur],R[cur]};
R[L[cur]]=R[cur],L[R[cur]]=L[cur];
}
ANS[q[j].id]=ans;
// undo
ans=tmpans;
while(rlen){
int u=rec[rlen].who,ul=rec[rlen].l,ur=rec[rlen].r;
R[ul]=u,L[ur]=u,rlen--;
}
j++;
}
ans=qaqans;
rep(i,1,n)L[i]=tmpL[i],R[i]=tmpR[i];
rep(cur,l,r){
bool ok1=L[cur],ok2=R[cur];
if(ok1)ans-=abs(L[cur]-cur);
if(ok2)ans-=abs(R[cur]-cur);
if(ok1&&ok2)ans+=abs(L[cur]-R[cur]);
R[L[cur]]=R[cur],L[R[cur]]=L[cur];
}
}
rep(i,1,m)print(ANS[i],'\n');
fprintf(stderr,"time used=%.10f\n",clock()/1./CLOCKS_PER_SEC);
return 0;
}
/*
6 2
4 1 6 2 3 5
1 4
3 6
*/
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 0
Dangerous Syscalls
input:
5 5 1 5 2 4 3 1 5 1 4 1 3 1 2 1 1