Submission #25798

#	Time	Username	Problem	Language	Result	Execution time	Memory
25798		kdh9949	즐거운 채소 기르기 (JOI14_growing)	C++14	100 / 100	153 ms	5536 KiB

growing

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

struct Dat{
	int x, i;
	bool operator<(const Dat &oth) const {
		return x < oth.x;
	}
};

int n;
Dat a[300010];
ll ans;

struct BIT{
	int dat[300010];
	void upd(int x, int v){ for(; x <= n; x += x & -x) dat[x] += v; }
	int get(int x){ int ret = 0; for(; x; x -= x & -x) ret += dat[x]; return ret; }
	int get(int s, int e){ return get(e) - get(s - 1); }
} B;

int main(){
	scanf("%d", &n);
	for(int i = 1, x; i <= n; i++){
		scanf("%d", &x);
		B.upd(i, 1);
		a[i] = {x, i};
	}
	sort(a + 1, a + n + 1);
	for(int i = 1, j; i <= n; i = j){
		for(j = i; j <= n && a[j].x == a[i].x; j++){
			B.upd(a[j].i, -1);
		}
		for(int k = i; k < j; k++){
			ans += min(B.get(1, a[k].i), B.get(a[k].i, n));
		}
	}
	printf("%lld\n", ans);
}

Compilation message (stderr)

growing.cpp: In function 'int main()':
growing.cpp:24:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
growing.cpp:26:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &x);
                  ^

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 15 / 15
• Subtask 4: 55 / 55