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 fi first
#define se second
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pill pair<int,ll>
#define mem(a, b) memset(a, b, sizeof(a))
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define name "test"
using namespace std;
const int N = 1e6 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18 + 69;
template <typename T1, typename T2> bool maxi(T1 &a, T2 b){if (a < b){a = b; return 1;} return 0;}
template <typename T1, typename T2> bool mini(T1 &a, T2 b){if (a > b){a = b; return 1;} return 0;}
int n;
int k;
int D;
int a[N];
int f[(int)7e3 + 2][(int)7e3 + 2];
void load(){
cin.tie(0)->sync_with_stdio(0);
if (fopen(name".inp", "r")){
freopen(name".inp", "r", stdin);
freopen(name".out", "w", stdout);
}
}
void input(){
cin >> n >> D;
for (int i = 1; i <= n; i++){
cin >> a[i];
}
}
void compress(){
vector <int> value;
for (int i = 1; i <= n; i++)
value.push_back(a[i]);
sort(value.begin(), value.end());
value.erase(unique(value.begin(), value.end()), value.end());
for (int i = 1; i <= n; i++)
a[i] = lower_bound(value.begin(), value.end(), a[i]) - value.begin() + 1;
k = value.size();
}
void solve(){
compress();
mem(f, -0x3f);
for (int i = 1; i <= n; i++){
f[i][a[i]] = 1;
for (int j = i - 1; j >= max(1, i - D); j--){
if (a[j] < a[i])
maxi(f[i][a[i]], f[j][a[i] - 1] + 1);
else maxi(f[i][a[j]], f[j][a[j]]);
}
for (int j = 1; j <= k; j++){
maxi(f[i][j], f[i][j - 1]);
}
}
cout << f[n][k];
}
int main(){
load();
input();
solve();
}
Compilation message (stderr)
Main.cpp: In function 'void load()':
Main.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
31 | freopen(name".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
32 | freopen(name".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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