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<bits/stdc++.h>
#define meio ((i+j)>>1)
using namespace std ;
const int maxn = 2e5 + 5 ;
const int MAX = 2e5 + 5 ;
const int lmt = 2e9 + 5 ;
int n, x, v[maxn] ;
vector<int> e, d, mx ;
struct SEG{
int node(){
e.push_back(0), d.push_back(0), mx.push_back(0) ;
return max(0, (int)d.size() - 1) ;
}
void upd(int no, int i, int j, int pos, int val){
if(!no) return ;
if(i == j){
mx[no] = max(val, mx[no]) ; return ;
}
if(pos <= meio){
if(!e[no]){
int aux = node() ;
e[no] = aux ;
}
upd(e[no], i, meio, pos, val) ;
}
else{
if(!d[no]){
int aux = node() ;
d[no] = aux ;
}
upd(d[no], meio + 1, j, pos, val) ;
}
mx[no] = max(mx[e[no]], mx[d[no]]) ;
}
void upd2(int no, int i, int j, int pos){
if(!no) return ;
if(i == j){
mx[no] = 0 ; return ;
}
if(pos <= meio){
if(!e[no]){
int aux = node() ;
e[no] = aux ;
}
upd2(e[no], i, meio, pos) ;
}
else{
if(!d[no]){
int aux = node() ;
d[no] = aux ;
}
upd2(d[no], meio + 1, j, pos) ;
}
mx[no] = 0 ;
}
int query(int no, int i, int j, int l, int r){
if(!no || l > j || r < i) return 0 ;
if(r >= j && l <= i) return mx[no] ;
return max(query(e[no], i, meio, l, r), query(d[no], meio + 1, j, l, r)) ;
}
} Seg ;
void solve_1(){
e.clear(), d.clear(), mx.clear() ;
Seg.node() ;
Seg.node() ;
int val = 0 ;
for(int i = 1 ; i <= n ; i++){
int mx = Seg.query(1, 1, lmt, 1, v[i] - 1) ;
Seg.upd(1, 1, lmt, v[i], mx + 1) ;
val = max(val, v[i]) ;
}
int ans = Seg.query(1, 1, lmt, 1, val+1) ;
cout << ans << "\n" ;
}
int try_val(int l, int r, int val){
for(int i = l ; i <= r ; i++) v[i] += val ;
e.clear(), d.clear(), mx.clear() ;
Seg.node() ;
Seg.node() ;
int va = 0 ;
for(int i = 1 ; i <= n ; i++){
int mx = Seg.query(1, 1, lmt, 1, v[i] - 1) ;
Seg.upd(1, 1, lmt, v[i], mx + 1) ;
va = max(va, v[i]) ;
}
int ans = Seg.query(1, 1, lmt, 1, va + 1) ;
for(int i = l ; i <= r ; i++) v[i] -= val ;
return ans ;
}
void solve_2(){
int ans = try_val(1, n, 0) ;
for(int l = 1 ; l <= n ; l++){
for(int r = l ; r <= n ; r++){
ans = max(ans, try_val(l, r, x)) ;
}
}
cout << ans << "\n" ;
}
int main(){
ios_base::sync_with_stdio(false) ; cin.tie(NULL) ;
cin >> n >> x ;
for(int i = 1 ; i <= n ; i++){
cin >> v[i] ;
v[i]++ ;
}
if(x == 0){
vector<int> vec ;
for(int i = 1 ; i <= n ; i++) vec.push_back(v[i]) ;
sort(vec.begin(), vec.end()) ;
vec.erase(unique(vec.begin(), vec.end()), vec.end()) ;
for(int i = 1 ; i <= n ; i++) v[i] = lower_bound(vec.begin(), vec.end(), v[i]) - vec.begin() + 1 ;
solve_1() ;
}
else solve_2() ;
}
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