/*
Code written by Talant I.D.
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
inline bool isvowel(char ch){
ch = tolower(ch);
return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
inline bool isprime(int n){
if(n < 2 || (n%2 == 0 && n != 2)) return false;
for(int i = 3; i*i <= n; i++)
if(n%i == 0) return false;
return true;
}
class Union{
private:
vector <int> saizu, link;
public:
Union(int n){
saizu.assign(n, 1); link.resize(n);
iota(all(link), 0);
}
int find(int n){
if(link[n] == n) return n;
return link[n] = find(link[n]);
}
int same(int a, int b){
return find(a) == find(b);
}
void unite(int a, int b){
if(same(a, b)) return;
a = find(a); b = find(b);
if(saizu[a] < saizu[b]) swap(a, b);
saizu[a] += saizu[b];
link[b] = a;
}
int getsize(int a){
return saizu[find(a)];
}
};
const int mod = 1e9+7;
ll mode(ll a){
a %= mod;
if(a < 0) a += mod;
return a;
}
ll subt(ll a, ll b){
return mode(mode(a)-mode(b));
}
ll add(ll a, ll b){
return mode(mode(a)+mode(b));
}
ll mult(ll a, ll b){
return mode(mode(a)*mode(b));
}
ll binpow(ll a, ll b){
ll res = 1;
while(b){
if(b&1) res = mult(res, a);
a = mult(a, a);
b >>= 1;
}
return res;
}
/*
struct Node{
ll val, l, r, sum;
Node operator + (Node other){
return {max(max(val, other.val), r+other.l), max(l, sum+other.l), max(other.r, other.sum+r), sum+other.sum};
}
};
class Segment_tree{
private:
vector <Node> tree;
//vector <int> lz;
public:
Segment_tree(int n){
tree.resize(n*4);
//lz.resize(n*4);
}
void build(int v, int l, int r){
if(l == r){
tree[v] = {max(0ll, vec[l]), max(0ll, vec[l]), max(0ll, vec[l]), vec[l]};
return;
}
int mid = (l+r) >> 1;
build(v*2, l, mid);
build(v*2+1, mid+1, r);
tree[v] = tree[v*2] + tree[v*2+1];
}
void push(int v, int l, int r){
if(lz[v]){
tree[v] += (r-l+1)*lz[v];
if(l != r){
lz[v*2] += lz[v];
lz[v*2+1] += lz[v];
}
lz[v] = 0;
}
}
int get(int v, int l, int r, int val){
if(l == r){
return l;
}
int mid = (l+r) >> 1;
if(tree[v*2] >= val) return get(v*2, l, mid, val);
else return get(v*2+1, mid+1, r, val);
}
void update(int v, int l, int r, int pos, ll val){
if(l == r && l == pos){
tree[v] = {max(0ll, val), max(0ll, val), max(0ll, val), val};
return ;
}
int mid = (l+r) >> 1;
if(pos <= mid) update(v*2, l, mid, pos, val);
else update(v*2+1, mid+1, r, pos, val);
tree[v] = tree[v*2] + tree[v*2+1];
}
ll get_first(){
return tree[1].val;
}
};*/
int main(){
do_not_disturb
int n, ans = 0;
cin >> n;
vector <int> v(n+2), pos(n+2), used(n+2);
for(int i = 1; i <= n; i++){
cin >> v[i];
pos[v[i]] = i;
}
for(int i = 1; i <= n; i++){
if(used[v[i]]) continue;
vector <int> tmp;
tmp.pb(v[i]);
int j = i+1;
while(j <= n && v[j] > tmp.back())
tmp.pb(v[j++]);
ans++;
vector <pii> consider;
for(int j = 0; j < sz(tmp)-1; j++){
int flag = 0;
vector <int> candidates;
candidates.pb(tmp[j]);
candidates.pb(tmp[j+1]);
for(int k = tmp[j]+1; k < tmp[j+1]; k++){
if(used[k]) flag++;
if(used[k] && (!used[k-1] || used[k+1])){
if(used[k] && !used[k-1] && !used[k+1]) candidates.pb(k), candidates.pb(k);
else candidates.pb(k);
}
}
sort(all(candidates));
if(flag) ans++;
for(int k = 0; k < sz(candidates); k += 2){
if(candidates[k]+1 != candidates[k+1]){
consider.pb(mp(candidates[k]+1, candidates[k+1]-1));
}
}
}
for(auto range : consider){
int tmpp = n+1;
for(int k = range.first; k <= range.second; k++){
if(pos[k]-1 != tmpp){
ans++;
}
used[k]++;
tmpp = pos[k];
}
}
for(auto to : tmp)
used[to]++;
i = j-1;
}
cout << ans;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
