結果

問題 No.913 木の燃やし方
ユーザー square1001square1001
提出日時 2019-10-18 23:12:24
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 3,416 bytes
コンパイル時間 1,628 ms
コンパイル使用メモリ 121,616 KB
実行使用メモリ 49,076 KB
最終ジャッジ日時 2024-06-25 19:15:07
合計ジャッジ時間 19,326 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 25 WA * 9
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <set>
#include <deque>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
vector<long long> subsolve(int N, vector<long long> A) {
	A.insert(A.begin(), 0);
	for (int i = 0; i < N; ++i) {
		A[i + 1] += A[i];
	}
	// minimize (A[i] - A[j]) + (i - j)^2 = (A[i] + i * i) + (-A[j] + j * j) - 2 * j * i for each i
	vector<long long> intercept(N + 1), slope(N + 1);
	for (int i = 0; i <= N; ++i) {
		intercept[i] = -A[i] + 1LL * i * i;
		slope[i] = -2 * i;
	}
	vector<int> seq(N + 1);
	deque<int> que;
	for (int i = 0; i <= N; ++i) {
		if (i >= 1) {
			seq[i] = que[0];
		}
		while (que.size() >= 2) {
			int pa = que[que.size() - 2];
			int pb = que[que.size() - 1];
			double cra = -double(intercept[pa] - intercept[i]) / (slope[pa] - slope[i]);
			double crb = -double(intercept[pb] - intercept[i]) / (slope[pb] - slope[i]);
			if (cra > crb) que.pop_back();
			else break;
		}
		que.push_back(i);
		while (que.size() >= 2) {
			int pa = que[0];
			int pb = que[1];
			long long va = 1LL * slope[pa] * (i + 1) + intercept[pa];
			long long vb = 1LL * slope[pb] * (i + 1) + intercept[pb];
			if (va > vb) que.pop_front();
			else break;
		}
	}
	vector<vector<long long> > qs;
	for (int i = 1; i <= N; ++i) {
		for (int j = seq[i - 1]; j <= seq[i]; ++j) {
			if (j != i) {
				qs.push_back({ A[i] - A[j] + 1LL * (i - j) * (i - j), j, i });
			}
		}
	}
	sort(qs.begin(), qs.end());
	set<int> st;
	for (int i = 0; i < N; ++i) {
		st.insert(i);
	}
	vector<long long> ans(N);
	for (vector<long long> i : qs) {
		set<int>::iterator it = st.lower_bound(i[1]);
		while (it != st.end() && *it < i[2]) {
			ans[*it] = i[0];
			it = st.erase(it);
		}
	}
	return ans;
}
vector<long long> solve(int N, vector<long long> A) {
	vector<long long> res1 = subsolve(N, A);
	reverse(A.begin(), A.end());
	vector<long long> res2 = subsolve(N, A);
	reverse(res2.begin(), res2.end());
	for (int i = 0; i < N; ++i) {
		res1[i] = min(res1[i], res2[i]);
	}
	return res1;
}
vector<long long> solve_easy(int N, vector<long long> A) {
	vector<long long> ans(N, 1LL << 62);
	for (int i = 0; i < N; ++i) {
		for (int j = i + 1; j <= N; ++j) {
			long long sum = 1LL * (j - i) * (j - i);
			for (int k = i; k < j; ++k) {
				sum += A[k];
			}
			for (int k = i; k < j; ++k) {
				ans[k] = min(ans[k], sum);
			}
		}
	}
	return ans;
}
#include <random>
#include <string>
using namespace std;
mt19937 mt(1910182301);
int rand_rng(int l, int r) {
	uniform_int_distribution<int> p(l, r - 1);
	return p(mt);
}
string stringify(vector<long long> A) {
	string res = "[";
	for (int i = 0; i < A.size(); ++i) {
		if (i) res += ", ";
		res += to_string(A[i]);
	}
	res += "]";
	return res;
}
int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(false);
	int N;
	cin >> N;
	vector<long long> A(N);
	for (int i = 0; i < N; ++i) cin >> A[i];
	vector<long long> ans = solve(N, A);
	for (int i = 0; i < N; ++i) {
		cout << ans[i] << '\n';
	}
	/*
	int N = 3;
	for (int i = 1; i <= 10000; ++i) {
		vector<long long> A(N);
		for (int j = 0; j < N; ++j) {
			A[j] = rand_rng(-6, 7);
		}
		vector<long long> res1 = solve(N, A);
		vector<long long> res2 = solve_easy(N, A);
		if (res1 != res2) {
			cout << "Case #" << i << ":" << endl;
			cout << "N = " << N << ", A = " << stringify(A) << endl;
			cout << "Returns: " << stringify(res1) << endl;
			cout << "Answer: " << stringify(res2) << endl;
			cout << endl;
		}
	}
	*/
	return 0;
}
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