Submission #697003

#	Time	Username	Problem	Language	Result	Execution time	Memory
697003		allllekssssa	Money (IZhO17_money)	C++14	100 / 100	131 ms	14948 KiB

money

#include<bits/stdc++.h>
 
using namespace std;
 
const int maxN = 1e6 + 10;
int a[maxN], bit[maxN];
int n;

void update(int x) {

	for (int i = x; i < maxN; i+=i&-i) {
		bit[i]++;
	}
}

int get(int x) {
	int ans = 0;

	for (int i = x; i > 0; i-=i&-i) {
		ans+=bit[i];
	}

	return ans;
}

void sredi(int l, int r) {
	for (int i = l; i <= r; i++) {
		update(a[i]);
	}
}
 
int main() {
 
	cin >> n;
 
	for (int i = 1; i<=n; i++) {
		scanf("%d", &a[i]);
	}
    
    int ans = 0;
    int pre = 0;
	for (int i = 1; i < n; i++) {
		if (i < n && a[i] > a[i + 1]) {
			++ans;
			sredi(pre + 1, i);
			pre = i;
			continue;
		}
        
		if (a[i] == a[i + 1]) continue;
        
        if (get(a[i + 1] - 1) - get(a[pre + 1]) > 0) {
        	++ans;
        	sredi(pre + 1, i);
        	pre = i;
        }
	}
 
	cout << ans + 1 << endl;
}

Compilation message (stderr)

money.cpp: In function 'int main()':
money.cpp:37:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

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