oj.uz

Submission #792807

# Submission time Handle Problem Language Result Execution time Memory
792807 2023-07-25T08:59:20 Z 이종영(#10088) Line Town (CCO23_day1problem3) C++17
7 / 25
 125 ms 14128 KB 
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.1,sse4.2,popcnt,abm,mmx,avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif
using ll=long long;
const ll inf=1e18;
const int N=5e5+5;
int n,a[N],idx[N];
ll dp[N][2],ans;
struct FT{
	int T[N]={0};
	void upd(int i,int v=1){
		for(;i<=n;i+=i&-i) T[i]+=v;
	}
	int qry(int i){
		int r=0;
		for(;i;i-=i&-i) r+=T[i];
		return r;
	}
}T;
int main(){
	ios::sync_with_stdio(false); cin.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		idx[i]=i;
	}
	sort(idx+1,idx+n+1,[&](int i,int j){
		return abs(a[i])<abs(a[j]);
	});
	T.upd(idx[1]);
	for(int i=2;i<=n;i++){
		int p=(idx[i]%2+2222)%2;
		dp[i][0]=dp[i][1]=inf;
		int L=T.qry(idx[i]),R=i-1-L;
		if(i&1){
			if(a[idx[i]]<0){
				dp[i][p]=dp[i-1][p]+L;
				dp[i][p^1]=dp[i-1][p]+R;
			} else{
				dp[i][p]=dp[i-1][p^1]+R;
				dp[i][p^1]=dp[i-1][p^1]+L;
			}
		} else{
			if(a[idx[i]]<0){
				dp[i][p^1]=min(dp[i-1][p]+R,dp[i-1][p^1]+L);
			} else{
				dp[i][p]=min(dp[i-1][p]+L,dp[i-1][p^1]+R);
			}
		}
		//cout<<dp[i][0]<<" "<<dp[i][1]<<" "<<idx[i]<<" "<<T.qry(idx[i])<<endl;
		T.upd(idx[i]);
	}
	ans=dp[n][n%2];
	if(ans>inf/2) ans=-1;
	cout<<ans;
	return 0;
}

Subtask #1
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct

Subtask #6
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 76 ms 14128 KB Output is correct
15 Correct 125 ms 14076 KB Output is correct
16 Correct 117 ms 14084 KB Output is correct
17 Correct 115 ms 14124 KB Output is correct
18 Correct 117 ms 14028 KB Output is correct
19 Correct 120 ms 14028 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 0 ms 340 KB Output is correct
22 Correct 115 ms 14064 KB Output is correct
23 Correct 114 ms 14076 KB Output is correct
24 Correct 62 ms 14032 KB Output is correct

Subtask #7
0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #8
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -