Submission #6118

#	Time	Username	Problem	Language	Result	Execution time	Memory
6118		ainta	즐거운 채소 기르기 (JOI14_growing)	C++98	100 / 100	120 ms	5776 KiB

growing

#pragma warning(disable:4996)
#include<stdio.h>
#include<algorithm>
int n, w[300010];
using namespace std;
struct A{
	int a, num;
	bool operator <(const A &p)const{
		return a != p.a ? a < p.a : num < p.num;
	}
}ord[300010];
int BIT[300010];
int Sum(int x){
	int r = 0;
	while (x){
		r += BIT[x];
		x -= (x&-x);
	}
	return r;
}
void Add(int x){
	while (x <= n){
		BIT[x]++;
		x += (x&-x);
	}
}
long long Res;
int main()
{
	int i, S, j, pv1, pv2, t, S2, cnt = 0;
	scanf("%d", &n);
	for (i = 1; i <= n; i++){
		scanf("%d", &w[i]);
		ord[i].a = w[i], ord[i].num = i;
	}
	sort(ord + 1, ord + n + 1);
	for (i = 1; i <= n; i++){
		for (j = i+1; j <= n; j++){
			if (ord[i].a != ord[j].a)break;
		}
		t = j;
		pv1 = i, pv2 = t - 1;
		while (pv1 <= pv2){
			cnt++;
			S = ord[pv1].num - 1 - Sum(ord[pv1].num);
			S2 = n - cnt - (ord[pv2].num - 1 - Sum(ord[pv2].num));
			if (S < S2){
				Add(ord[pv1].num);
				Res += S;
				pv1++;
			}
			else{
				Add(ord[pv2].num);
				Res += S2;
				pv2--;
			}
		}
		i = t - 1;
	}
	printf("%lld\n", Res);
}

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