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 int long long
using namespace std ;
const int maxn = 55 + 5 ;
const int inf = 1e4 + 1 ;
int n, x, v[maxn] ;
int bit[6*inf] ;
struct BIT{
void upd(int pos, int val){
if(pos <= 0) return ;
for(; pos < 4*inf ; pos += pos&-pos) bit[pos] = max(bit[pos], val) ;
}
int query(int pos){
if(pos <= 0) return 0 ;
int tot = 0 ;
for(; pos > 0 ; pos -= pos&-pos) tot = max(tot, bit[pos]) ;
return tot ;
}
} Bit ;
void solve_1(){
int val = 0 ;
for(int i = 1 ; i <= n ; i++){
int mx = Bit.query(v[i] - 1) ;
Bit.upd(v[i], mx + 1) ;
val = max(val, v[i]) ;
}
int ans = Bit.query(val+1) ;
cout << ans << "\n" ;
}
int try_val(int l, int r, int val){
// cout << l << " " << r << " " << val << "\n" ;
for(int i = 1 ; i < inf ; i++) bit[i] = 0 ;
for(int i = l ; i <= r ; i++) v[i] += val ;
int va = 0 ;
for(int i = 1 ; i <= n ; i++){
int mx = Bit.query(v[i] - 1) ;
Bit.upd(v[i], mx + 1) ;
va = max(va, v[i]) ;
}
int ans = Bit.query(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 i = 1 ; i <= x ; i++){ // add
for(int l = 1 ; l <= n ; l++){
for(int r = l ; r <= n ; r++){
ans = max(ans, try_val(l, r, i)) ;
ans = max(ans, try_val(l, r, -i)) ;
}
}
}
cout << ans << "\n" ;
}
int32_t 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] += (x + 1) ;
}
if(x == 0) solve_1() ;
else solve_2() ;
}
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