Submission #501614

#	Time	Username	Problem	Language	Result	Execution time	Memory
501614		mansur	Money (IZhO17_money)	C++17	100 / 100	1189 ms	101048 KiB

money

#include<bits/stdc++.h>	
 
#pragma optimize ("g",on)
#pragma GCC optimize ("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
#pragma comment(linker, "/stack:200000000")

//01001101 01100001 01101011 01101000 01100001  01100111 01100001 01111001 

using namespace std;

#define all(a) a.begin(), a.end()                                                   
#define rall(a) a.rbegin(), a.rend()
#define ll long long
#define pb push_back
#define sz(a) a.size()
#define nl '\n'
#define popb pop_back()                                                                   
#define ld double
#define ull unsigned long long
#define ff first                                         
#define ss second  
#define fix fixed << setprecision
#define pii pair<int, int>                          
#define E exit (0)
#define int long long
 
const int inf = 1e18, N = 1e6 + 1, mod = 998244353;                    

vector<pii> dir = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};

vector<int> t(4 * N, inf);

void update(int u, int tl, int tr, int l, int r, int val) {
	if (tl > r || tr < l) return;
	if (tl >= l && tr <= r) {
		t[u] = min(t[u], val);
		return;
	}
	int mid = (tl + tr) / 2;
	update(u * 2, tl, mid, l, r, val);
	update(u * 2 + 1, mid + 1, tr, l, r, val);
}

int get(int u, int tl, int tr, int pos) {
	if (tl == tr) return t[u];
	int mid = (tl + tr) / 2;
	if (pos <= mid) {
	 	return min(get(u * 2, tl, mid, pos), t[u]);
	}
	return min(get(u * 2 + 1, mid + 1, tr, pos), t[u]);
}

main() {                                                         
	//freopen("cowrect.in", "r", stdin);                                                                                     
	//freopen("cowrect.out", "w", stdout);                                                                                     
	ios_base::sync_with_stdio(NULL);                                                                                        
	cin.tie(NULL);  
	int n;
	cin >> n;
	int a[n + 1], r[n + 1];
	for (int i = 1; i <= n; i++) cin >> a[i];
	int l = 1;
	for (int i = 2; i <= n; i++) {
		if (a[i] < a[i - 1]) {
			while (l < i) {
            	r[l++] = i - 1;
            }
		}
	}
	while (l <= n) {
       	r[l++] = n;
	}
	set<int> s;
	update(1, 0, n, 0, 0, 0);
	for (int i = 1; i <= n; i++) {
		auto it = s.upper_bound(a[i]);
		int val;
		if (it == s.end()) val = inf;
		else val = *it;
		int tl = i, tr = r[i], pos;
		while (tl <= tr) {
		    int mid = (tl + tr) / 2;
		    if (a[mid] <= val) {
		   		tl = mid + 1;
		   		pos = mid;
		    }else tr = mid - 1;
		}
		update(1, 0, n, i, pos, get(1, 0, n, i - 1) + 1);
		s.insert(a[i]);
	}
	cout << get(1, 0, n, n);
}

Compilation message (stderr)

money.cpp:3: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    3 | #pragma optimize ("g",on)
      | 
money.cpp:9: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    9 | #pragma comment(linker, "/stack:200000000")
      | 
money.cpp:57:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   57 | main() {
      | ^~~~
money.cpp: In function 'int main()':
money.cpp:45:8: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   45 |  update(u * 2 + 1, mid + 1, tr, l, r, val);
      |  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
money.cpp:84:26: note: 'pos' was declared here
   84 |   int tl = i, tr = r[i], pos;
      |                          ^~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55