This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// Om Namah Shivaya
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl
#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)
template<typename T>
void amin(T &a, T b) {
a = min(a, b);
}
template<typename T>
void amax(T &a, T b) {
a = max(a, b);
}
#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif
/*
refs:
https://oj.uz/submission/684363
*/
const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
const ld eps = 1e-9;
#include "mountains.h"
int maximum_deevs(vector<int> a) {
int n = sz(a);
int dp[n][n];
memset(dp,0,sizeof dp);
rev(l,n-1,0){
dp[l][l] = 1;
vector<int> b;
b.pb(l);
ld grad = -inf2;
for(int r = l + 1; r < n; ++r){
// ignore l
dp[l][r] = dp[l+1][r];
// pick l
ld curr = (a[r]-a[l]) / (ld) (r-l);
if(curr >= grad-eps){
b.pb(r);
grad = curr;
}
b.pb(r+1);
int pick = 1;
rep(i,sz(b)-1){
if(b[i]+1 <= b[i+1]-1){
pick += dp[b[i]+1][b[i+1]-1];
}
}
amax(dp[l][r], pick);
b.pop_back();
}
}
// rep(l,n){
// rep(r,n){
// cout << dp[l][r] << " ";
// }
// cout << endl;
// }
return dp[0][n-1];
}
Compilation message (stderr)
mountains.cpp: In function 'int maximum_deevs(std::vector<int>)':
mountains.cpp:30:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
30 | #define rep(i, n) for(int i = 0; i < n; ++i)
......
93 | rep(i,sz(b)-1){
| ~~~~~~~~~
mountains.cpp:93:4: note: in expansion of macro 'rep'
93 | rep(i,sz(b)-1){
| ^~~
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