【BZOJ 2006】[NOI2010] 超级钢琴


另外这题还有ST表的做法,但还不是很会 qwq

#define LL long long
using namespace std;

const int N = 500000+9;
const int M = 20000000+9;
const int BAS = 500000010;
const int INF = 1000010000;

int n,k,L,R,arr[N];
struct Query{
	int pos,num,val;
	bool operator < (const Query & B) const {
		return val < B.val;
priority_queue<Query> que;

namespace Chair_Tree{
	#define CT Chair_Tree
	int ch[M][2],sum[M],cnt,root[N],ans_tmp;
	void insert(int p, int &w, int l, int r, int v) {
		w = ++cnt; sum[w] = sum[p] + 1;
		if (l < r) {
			int mid = l + r + 1 >> 1;
			if (v < mid) insert(ch[p][0], ch[w][0], l, mid-1, v);
			else insert(ch[p][1], ch[w][1], mid, r, v);
	inline void insert(int p, int w) {
		insert(root[p-1], root[p], 1, INF, w);
	void query(int p, int w, int l, int r, int num) {
		if (l == r) ans_tmp = l;
		else {
			int mid = l + r + 1 >> 1;
			if (sum[ch[w][1]] - sum[ch[p][1]] >= num) query(ch[p][1], ch[w][1], mid, r, num);
			else query(ch[p][0], ch[w][0], l, mid-1, num - (sum[ch[w][1]] - sum[ch[p][1]]));
	inline int query(int l, int r, int num) {
		return ans_tmp;

inline int read(){
	char c=getchar(); int ret=0,f=1;
	while (c<'0'||c>'9') {if(c=='-')f=-1;c=getchar();}
	while (c<='9'&&c>='0') {ret=ret*10+c-'0';c=getchar();}
	return ret*f;

int main(){
	n = read(); k = read(); L = read(); R = read();
	for (int i=1;i<=n;i++) arr[i] = arr[i-1] + read();
	for (int i=1;i<=n;i++) CT::insert(i,arr[i] + BAS);
	for (int i=1;i+L-1<=n;i++) {
		Query tmp; tmp.pos = i; tmp.num = 1;
		tmp.val = CT::query(i+L-1, min(n,i+R-1), 1) - BAS - arr[i - 1];
	LL vout = 0;
	for (int i=1,p;i<=k;i++) {
		Query tmp = que.top(); que.pop();
		vout += tmp.val; 
		if (tmp.num < R - L + 1) {
			tmp.num++; p = tmp.pos;
			if (n - (p+L-1) + 1 < tmp.num) continue;
			tmp.val = CT::query(p+L-1, min(n,p+R-1), tmp.num) - arr[p - 1] - BAS;
	return 0;

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