Codeforces 1353D Constructing the Array

題目鏈接：

https://codeforces.com/contest/1353/problem/D

思路：

我們將所有待處理的子線段按照{長度，左端點序號，右端點序號}按序存儲在優先隊列中，然後挨個處理即可；

代碼：

#include<bits/stdc++.h>

using namespace std;

struct seg {
	int len, l, r;
	bool operator < (const seg & s) const {
		return len == s.len ? s.l < l : s.len > len;
	}
};
void solve(int & n) {
	priority_queue<seg> que;
	que.push(seg{n, 1, n});
	vector<int> ans(n + 1);
	int cnt = 1;
	while(!que.empty()) {
		seg s = que.top();
		que.pop();
		int mid = s.l + s.r;
		if(mid & 1) mid = (mid - 1) >> 1;
		else mid >>= 1;
		ans[mid] = cnt++;
		if(mid - 1 >= s.l) que.push(seg{mid - s.l, s.l, mid - 1});
		if(s.r >= mid + 1) que.push(seg{s.r - mid, mid + 1, s.r});
	}
	for(int i = 1; i <= n; i++) printf("%d ", ans[i]);
	putchar('\n');
}

int main() {
#ifdef MyTest
	freopen("Sakura.txt", "r", stdin);
#endif
	int kase;
	scanf("%d", &kase);
	while(kase--) {
		int n;
		scanf("%d", &n);
		solve(n);
	}	
	return 0;	
}