oj.uz

답안 #792605

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
792605 2023-07-25T07:20:50 Z 박상훈(#10052) Line Town (CCO23_day1problem3) C++17
7 / 25
 236 ms 16136 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

constexpr ll INF = 4e18;

struct Seg{
	int tree[2002000];
	int sz;

	void init(int n){
		sz = n;
		fill(tree, tree+sz*2, 0);
	}

	void update(int p, ll x){
		p += sz;
		tree[p] = x;
		for (p>>=1;p;p>>=1) tree[p] = tree[p<<1] + tree[p<<1|1];
	}

	int query(int l, int r){
		++r;
		int ret = 0;
		for (l+=sz, r+=sz;l<r;l>>=1, r>>=1){
			if (l&1) ret += tree[l++];
			if (r&1) ret += tree[--r];
		}

		return ret;
	}
}tree;

int a[500500], I[500500];
ll dp[2][500500];

int f(int s, int e, int val){
	if ((e-s)%2 == 0) return val;
	return -val;
}

int main(){
	int n;
	scanf("%d", &n);
	for (int i=1;i<=n;i++) scanf("%d", a+i);

	for (int i=1;i<=n;i++) I[i] = i;
	sort(I+1, I+n+1, [&](int i, int j){return abs(a[i]) < abs(a[j]);});
	tree.init(n+1);

	for (int i=1,r;i<=n;i=r+1){
		r = i;
		while(r+1<=n && abs(a[I[i]]) == abs(a[I[r+1]])) r++;

		assert(i==r);

		// abs distinct
		int pos = I[i];
		for (int z=0;z<2;z++){
			dp[z][i] = INF;

			if (f(pos, z, a[pos]) == -abs(a[pos])) dp[z][i] = min(dp[z][i], dp[z^1][i-1] + tree.query(1, pos-1));
			if (f(pos, z+i-1, a[pos]) == abs(a[pos])) dp[z][i] = min(dp[z][i], dp[z][i-1] + tree.query(pos+1, n));

			if (i==1) dp[z][i] = 0;

			// printf("%d %d -> %lld\n", z, i, dp[z][i]);
		}

		tree.update(pos, 1);
	}

	if (dp[1][n]==INF) printf("-1\n");
	else printf("%lld\n", dp[1][n]);
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:45:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
Main.cpp:46:30: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  for (int i=1;i<=n;i++) scanf("%d", a+i);
      |                         ~~~~~^~~~~~~~~~~

Subtask #1
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #5
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 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 1 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 1 ms 340 KB Output is correct

Subtask #6
3.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 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 1 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 1 ms 340 KB Output is correct
14 Correct 151 ms 16124 KB Output is correct
15 Correct 230 ms 16084 KB Output is correct
16 Correct 220 ms 16076 KB Output is correct
17 Correct 225 ms 16076 KB Output is correct
18 Correct 229 ms 16076 KB Output is correct
19 Correct 236 ms 16084 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 0 ms 340 KB Output is correct
22 Correct 199 ms 16076 KB Output is correct
23 Correct 181 ms 16136 KB Output is correct
24 Correct 138 ms 15984 KB Output is correct

Subtask #7
0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #8
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -