// Song Đồng Gia Phúc
/*
* ʕ•ᴥ•ʔ
* [Penguin_024]
* U U
*/
#include<bits/stdc++.h>
using namespace std;
#define el '\n'
#define ll long long
#define ull unsigned long long
#define vll vector<ll>
#define double double
#define fi first
#define se second
#define cico(A) freopen(A".INP","r",stdin); freopen(A".OUT","w",stdout);
template<typename x,typename y> void amin(x &a,y b){if(b<a) a=b;}
template<typename x,typename y> void amax(x &a,y b){if(b>a) a=b;}
const int maxn=3e5+7,maxq=19*1e4+7;
const string yes="YES\n",no="NO\n";
int n,d,a[maxn];
int ans,res,oo=1e9+7;
/////// SUB 4
void sub4(){
vector<int> f;
ans = 0;
for(int i=n;i>0;--i){
while( !f.empty() && a[i]>=f.back() ) f.pop_back();
f.push_back(a[i]);
amax( ans , f.size() );
}
cout << ans;
}
/////// SUB 1
void quaylui(int id,int maxi,int sum,int kc){
if(kc>=d) return;
if(id==n+1){
amax(ans,sum);
return;
}
quaylui( id+1 , max(maxi,a[id]) , sum + (a[id]>maxi) , 0 );
quaylui( id+1 , maxi , sum , kc + (sum>0) );
}
void sub1(){
ans = 0;
quaylui(1,-1,0,0);
cout << ans;
}
/////// SUB 5
void sub5(){
vector<int> f(1,-1);
for(int i=1;i<=n;++i){
if( a[i]>f.back() ){
f.push_back(a[i]);
} else {
res = lower_bound( f.begin() , f.end() , a[i] ) - f.begin();
f[res] = a[i];
}
}
ans = f.size() - 1;
cout << ans;
}
/////// SUB 2
void sub2(){
const int maxx=407;
int dp[maxx][maxn];
for(int i=1;i<=n;++i){
for(int j=1;j<=n;++j) dp[i][j] = oo;
}
for(int i=1;i<=n;++i){
dp[i][1] = a[i];
for(int j=i-1;j>0 && i-j<=d;j--){
for(int z=2;z<=i;z++){
if( a[i] > dp[j][z-1] ) amin( dp[i][z] ,a[i] );
amin( dp[i][z] , max(dp[j][z],a[i]) );
}
}
}
for(int i=1;i<=n;++i) if(dp[n][i] < oo) ans=i;
cout << ans;
}
/////// SUB 3
void sub3(){
const int maxx = 7e3+7;
int dp[maxx];
bool ok,kc=0;
ans = 0;
for(int i=1;i<=n;++i){
dp[i] = 1;
for(int j=i-1;j>0;--j){
if( a[i] > a[j] ){
amax( dp[i] , dp[j] + 1 );
kc=0;
} else kc++;
if(kc>=d) break;
}
amax(ans,dp[i]);
}
cout << ans;
}
signed main(){
ios_base::sync_with_stdio(0);cin.tie(0);
cin >> n >> d;
for(int i=1;i<=n;++i){
cin >> a[i];
}
// sub 4
if(d==1){
sub4();
return 0;
}
// sub 1
if(n<=20){
sub1();
return 0;
}
// sub 5
if(d==n){
sub5();
return 0;
}
// sub 2
if(n<=400){
sub2();
}
// sub 3
if(n<=7000){
sub3();
}
return 0;
}
Compilation message
Main.cpp: In function 'void sub3()':
Main.cpp:104:20: error: use of an operand of type 'bool' in 'operator++' is forbidden in C++17
104 | } else kc++;
| ^~
Main.cpp:96:10: warning: unused variable 'ok' [-Wunused-variable]
96 | bool ok,kc=0;
| ^~
Main.cpp: In instantiation of 'void amax(x&, y) [with x = int; y = long unsigned int]':
Main.cpp:35:30: required from here
Main.cpp:21:57: warning: comparison of integer expressions of different signedness: 'long unsigned int' and 'int' [-Wsign-compare]
21 | template<typename x,typename y> void amax(x &a,y b){if(b>a) a=b;}
| ~^~
