Submission #166398

#	Time	Username	Problem	Language	Result	Execution time	Memory
166398		abil	Money (IZhO17_money)	C++14	0 / 100	2 ms	380 KiB

money

#include <bits/stdc++.h>
 
#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define all(s) s.begin(),s.end()
#define int long long
 
using namespace std;
 
const int N = (1e6 + 12);
const int mod = (1e9 + 7);
const int INF = (1e15 + 9);

int t[N], a[N], n, cnt[N];

void update(int ind){
	for(;ind <= n; ind = ind | (ind + 1)){
		t[ind]++;
	}
}

int get(int pos){
	int res = 0;
	for(;pos >= 1; pos = (pos & (pos + 1)) - 1){
		res += t[pos];
	}
	return res;
}
main()
{
	int ans = 0;
	cin >> n;
	for(int i = 1;i <= n; i++){
		scanf("%lld", &a[i]);
	}
	int pos = 0;
	for(int i = 1;i <= n; i++){
		if(a[i] == a[i + 1]){
			continue;
		}
		pos++;
		a[pos] = a[i];
	}
	n = pos;
	ans++;
	update(a[n]);
	for(int i = n - 1;i >= 1; i--){
		if(a[i] < a[i + 1]){
			if(get(a[i + 1]) - get(a[i]) != a[i + 1] - a[i]){
				ans++;
			}
		}
		else{
			ans++;
		}
		if(cnt[a[i]] == 0){
			update(a[i]);
			cnt[a[i]] = 1;			
		}
	}
	cout << ans;
}

Compilation message (stderr)

money.cpp:31:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
money.cpp: In function 'int main()':
money.cpp:36:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld", &a[i]);
   ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55