// Nurstan Duisengaliev(REALBOY)
// не, не надо меня узнавать
/*#pragma GCC target ("avx2")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("O3")*/
#include <bits/stdc++.h>
#define ll long long
#define all(x) x.begin(), x.end()
#define in insert
#define mp make_pair
#define F first
#define S second
#define ppf pop_front
#define pb push_back
#define ppb pop_back
#define pf push_front
#define pii pair <int, int>
#define pll pair <ll, ll>
#define boost() ios_base::sync_with_stdio(0), cin.tie(0)
#define sz(x) (int)x.size()
using namespace std;
const int N = (int)2e5 + 123;
const int mod = (int)1e9 + 7;
const ll INF = (ll)1e18 + 1;
int n;
int a[N];
int d[N * 4];
map <int, int> last;
void build (int v, int l, int r) {
if (l == r) {
d[v] = a[l];
return;
}
int mid = l + r >> 1;
build (v * 2, l, mid);
build (v * 2 + 1, mid + 1, r);
d[v] = min (d[v * 2], d[v * 2 + 1]);
}
int get (int v, int l, int r, int nl, int nr) {
if (nl > r || l > nr) return mod;
if (nl <= l && r <= nr) return d[v];
int mid = l + r >> 1;
return min (get (v * 2, l, mid, nl, nr), get (v * 2 + 1, mid + 1, r, nl, nr));
}
void solve () {
cin >> n;
for (int i = 1; i <= n; i ++) {
cin >> a[i];
}
build (1, 1, n);
int ans = 0;
for (int i = 1; i <= n; i ++) {
if (a[i] != 0) {
if (last[a[i]] == 0) {
ans ++;
}
else {
if (get (1, 1, n, last[a[i]], i) < a[i]) {
ans ++;
}
}
last[a[i]] = i;
}
}
cout << ans;
}
main () {
// freopen (".in", "r", stdin);
// freopen (".out", "w", stdout);
boost ();
int TT = 1;
// cin >> TT;
while (TT --) {
solve ();
}
return 0;
}
Compilation message
Main.cpp: In function 'void build(int, int, int)':
Main.cpp:40:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
40 | int mid = l + r >> 1;
| ~~^~~
Main.cpp: In function 'int get(int, int, int, int, int)':
Main.cpp:48:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
48 | int mid = l + r >> 1;
| ~~^~~
Main.cpp: At global scope:
Main.cpp:74:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
74 | main () {
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
19 ms |
1004 KB |
Output is correct |
| 5 |
Correct |
30 ms |
1644 KB |
Output is correct |
| 6 |
Correct |
60 ms |
4076 KB |
Output is correct |
| 7 |
Correct |
44 ms |
6508 KB |
Output is correct |
