This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "elephants.h"
#include <bits/stdc++.h>
using namespace std;
#define foreach(it, x) for(type(x) it = x.begin(); it != x.end(); it++)
#define type(x) __typeof(x.begin())
#define mp make_pair
#define pb push_back
#define nd second
#define st first
#define next sadas
const int inf = 1e9 + 5;
const int N = 2e6 + 5;
int SQ;
typedef pair< int , int > pii;
typedef long long ll;
int SQQ, sss, n, m, x, y, z, t, S, xx[N], wh[N];
pii next[N];
vector< pii > v[N];
set< pii > SS;
pii take(int ind, int w) {
int t = 0, ss = v[w][ind].st;
while(w <= S && (!v[w].size() || (v[w].rbegin()->st) <= ss + m)) w++;
if(w > S) return mp(inf + 5, inf + 5);
return mp(lower_bound(v[w].begin(), v[w].end(), mp(ss + m + 1, 0)) - v[w].begin(), w);
}
int take() {
pii cur = mp(0, 1);
int ans = 0;
while(!v[cur.nd].size()) cur.nd++;
while(cur.nd < inf) {
int u = v[cur.nd][cur.st].nd;
if(next[u].st) { ans += next[u].st; cur.st = next[u].nd; }
else { cur = take(cur.st, cur.nd); ans++; }
}
return ans;
}
void init(vector< pii > &v) {
int ind = (int)v.size()-1;
for(int i = (int) v.size() - 1; i >= 0; i--) {
int zz = v[i].nd;
while(ind >= 0 && v[ind] >= mp(v[i].st + m + 1, 0)) ind--;
ind++;
if(ind == v.size()) next[zz] = mp(0, i);
else {
int indd = v[ind].nd;
next[zz] = mp(next[indd].st + 1, next[indd].nd);
}
ind--;
}
}
void init() {
vector< pii > ss;
for(int i = 1; i <= S; i++) {
foreach(it, v[i])
ss.pb(*it);
v[i].clear();
}
if(!sss) {
for(int i = 1; i <= n; i++)
ss.pb(mp(xx[i], i));
}
int s = 0; S = 0;
vector< pii > :: iterator it2 = ss.end(); it2--;
vector< pii > temp;
foreach(it, ss) {
temp.pb(*it);
if(++s % SQ == 0 || (it == it2)) {
v[++S] = temp;
foreach(it, temp) wh[it->nd] = S;
init(v[S]);
temp.clear();
}
}
ss.clear();
}
void del(int x, int y) {
int ww = wh[y];
v[ww].erase(find(v[ww].begin(), v[ww].end(), mp(x, y)));
init(v[ww]);
}
void ins(vector< pii > &v, pii x) {
vector< pii > temp;
int t = 0;
foreach(it, v) {
if(!t && *it > x) { temp.pb(x); t = 1; }
temp.pb(*it);
}if(!t) temp.pb(x);
v = temp;
temp.clear();
}
void add(int x, int y) {
int ww = S;
while(ww > 1 && (!v[ww].size() || *v[ww].begin() > mp(x, y))) ww--;
wh[y] = ww;
ins(v[ww], mp(x, y));
init(v[ww]);
}
void init(int N, int L, int X[]) {
n = N;
m = L;
SQ = 500;
SQQ = 2000;
for(int i = 0; i < n; i++) {
xx[i+1] = X[i];
SS.insert(mp(X[i], i+1));
}
init();
}
int update(int i, int y) {
i++;
del(xx[i], i);
add(xx[i] = y, i);
if(++sss % SQQ == 0) init();
return take();
}
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