제출 #591139

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
591139		GusterGoose27	The short shank; Redemption (BOI21_prison)	C++11	45 / 100	2070 ms	63448 KiB

prison

// #pragma GCC optimize("Ofast")
// #pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

typedef long double ld;
typedef pair<ld, int> pdi;
typedef pair<int, int> pii;

const int MAXN = 2e6;
const int MAX_ALLOC = (1 << 22);
pdi dp[MAXN];
const int inf = 1e9;
int m, d, t;
int vals[MAXN];
pdi mn[MAX_ALLOC];
int lz[MAX_ALLOC];
int lval[MAX_ALLOC];
int rval[MAX_ALLOC];

int n;

void make() {
	n = pow(2, ceil(log2(m)));
	for (int i = 1; i < 2*n; i++) mn[i] = pdi(inf, 0);
	for (int i = n; i < 2*n; i++) {
		lval[i] = i-n;
		rval[i] = i-n+1;
	}
	for (int i = n-1; i > 0; i--) {
		lval[i] = lval[2*i];
		rval[i] = rval[2*i+1];
	}
}
void clean() {
	for (int i = 1; i < 2*n; i++) mn[i] = pdi(inf, 0);
	fill(lz, lz+2*n, 0);
}
void increment(int l, int r, int v, int cur = 1) {
	if (lval[cur] >= r || rval[cur] <= l) return;
	if (lval[cur] >= l && rval[cur] <= r) {
		lz[cur] += v;
		mn[cur].first += v;
		return;
	}
	increment(l, r, v, 2*cur);
	increment(l, r, v, 2*cur+1);
	mn[cur] = min(mn[2*cur], mn[2*cur+1]);
	mn[cur].first += lz[cur];
}
pdi mnval(int l, int r, int cur = 1, int laz = 0) {
	if (lval[cur] >= r || rval[cur] <= l) return pdi(inf, 0);
	if (lval[cur] >= l && rval[cur] <= r) return pdi(mn[cur].first+laz, mn[cur].second);
	laz += lz[cur];
	return min(mnval(l, r, 2*cur, laz), mnval(l, r, 2*cur+1, laz));
}
void update(int i, pdi v, int cur = 1, int laz = 0) {
	if (lval[cur] > i || rval[cur] <= i) return;
	if (cur >= n) {
		mn[cur] = pdi(v.first-laz, v.second);
		return;
	}
	laz += lz[cur];
	update(i, v, 2*cur, laz);
	update(i, v, 2*cur+1, laz);
	mn[cur] = min(mn[2*cur], mn[2*cur+1]);
	mn[cur].first += lz[cur];
}

int iters = 25;
//const ld prec = 3e-2;

int get_int(int i) {
	if (vals[i] > t) return i;
	return i+(t-vals[i])+1;
}

bool make_iter(ld &mn, ld &mx, bool force = 0) {
	vector<int> uncolored;
	//STree s(n);
	ld cost = (mn+mx)/2;
	for (int i = m-1; i >= 0; i--) {
		if (i == m-1) dp[i] = pdi(0, 0);
		else {
			pdi mval = mnval(i+1, m);
			mval.first += cost;
			mval.second++;
			dp[i] = mval;
		}
		// if (dp[i].second > d) {
		// 	mn = cost;
		// 	return 0;
		// }
		if (d == 1 && dp[i].second > d) update(i, pdi(inf, 0));
		else update(i, dp[i]);
		uncolored.push_back(i);
		int r = get_int(i);
		int pos = uncolored.size()-1;
		while (pos >= 0 && uncolored[pos] < r) pos--;
		pos++;
		int prev = n;
		int mult = uncolored.size()-pos;
		for (int i = pos; i < uncolored.size(); i++) {
			increment(uncolored[i], prev, mult);
			prev = uncolored[i];
			mult--;
		}
		int num = uncolored.size()-pos;
		for (int i = 0; i < num; i++) uncolored.pop_back();
	}
	pdi overall = mnval(0, m-1);
	if (overall.second == d || force) { // we are done
		cout << round(overall.first-cost*d) << "\n";
		return 1;
	}
	if (overall.second < d) mx = cost;
	else mn = cost;
	return 0;
}

void spec() {
	vector<int> uncolored;
	//STree s(n);
	//ld cost = (mn+mx)/2;
	for (int i = m-1; i >= 0; i--) {
		if (i == m-1) dp[i] = pdi(0, 0);
		else {
			pdi mval = mnval(m-1, m);
			//mnval.first += cost;
			mval.second++;
			dp[i] = mval;
		}
		// if (dp[i].second > d) {
		// 	mn = cost;
		// 	return 0;
		// }
		if (d == 1 && dp[i].second > d) update(i, pdi(inf, 0));
		else update(i, dp[i]);
		uncolored.push_back(i);
		int r = get_int(i);
		int pos = uncolored.size()-1;
		while (pos >= 0 && uncolored[pos] < r) pos--;
		pos++;
		int prev = n;
		int mult = uncolored.size()-pos;
		for (int i = pos; i < uncolored.size(); i++) {
			increment(uncolored[i], prev, mult);
			prev = uncolored[i];
			mult--;
		}
		int num = uncolored.size()-pos;
		for (int i = 0; i < num; i++) uncolored.pop_back();
	}
	pdi overall = mnval(0, m-1);
	cout << round(overall.first) << "\n";
	return;
	// if (overall.second == d || force) { // we are done
	// 	cout << round(overall.first-cost*d) << "\n";
	// 	//return 1;
	// }
	// if (overall.second < d) mx = cost;
	// else mn = cost;
	// return 0;
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL);
	cin >> m >> d >> t;
	if (m > 75000) iters = 15;
	for (int i = 0; i < m; i++) cin >> vals[i];
	ld mn = 0;
	ld mx = ((ld)m)/d+1;
	make();
	if (d == 1) {
		spec();
		return 0;
	}
	for (int t = 0; t < iters; t++) {
	//while (mx-mn > prec) {
		bool fin = make_iter(mn, mx);
		if (fin) return 0;
		clean();
	}
	//assert(false);
	make_iter(mn, mx, 1);
}

컴파일 시 표준 에러 (stderr) 메시지

prison.cpp: In function 'bool make_iter(ld&, ld&, bool)':
prison.cpp:105:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |   for (int i = pos; i < uncolored.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~
prison.cpp: In function 'void spec()':
prison.cpp:148:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  148 |   for (int i = pos; i < uncolored.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 25
• Subtask 6: 0 / 20