Submission #591097

# Submission time Handle Problem Language Result Execution time Memory
591097 2022-07-06T21:23:09 Z GusterGoose27 The short shank; Redemption (BOI21_prison) C++11
0 / 100
3 ms 468 KB
#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;
pdi dp[MAXN];
const int inf = 1e9;
int n, d, t;
int vals[MAXN];

class STree {
public:
	int n;
	pdi *mn;
	int *lz;
	int *lval;
	int *rval;
	STree(int nn) {
		n = pow(2, ceil(log2(nn)));
		mn = new pdi[2*n];
		lz = new int[2*n];
		lval = new int[2*n];
		rval = new int[2*n];
		for (int i = 1; i < 2*n; i++) mn[i] = pdi(inf, 0);
		fill(lz, lz+2*n, 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 increment(int l, int r, int cur = 1) {
		if (lval[cur] >= r || rval[cur] <= l) return;
		if (lval[cur] >= l && rval[cur] <= r) {
			lz[cur]++;
			mn[cur].first++;
			return;
		}
		increment(l, r, 2*cur);
		increment(l, r, 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];
	}
};

const int iters = 30;

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

bool make_iter(ld &mn, ld &mx) {
	vector<int> uncolored;
	STree s(n);
	ld cost = (mn+mx)/2;
	for (int i = n-1; i >= 0; i--) {
		if (i == n-1) dp[i] = pdi(0, 0);
		else {
			pdi mnval = s.mnval(i+1, n);
			mnval.first += cost;
			mnval.second++;
			dp[i] = mnval;
		}
		s.update(i, dp[i]);
		uncolored.push_back(i);
		int r = get_int(i);
		while (!uncolored.empty() && uncolored.back() < r) {
			int cur = uncolored.back();
			uncolored.pop_back();
			s.increment(cur, n);
		}
	}
	pdi overall = s.mnval(0, n);
	if (overall.second == d) { // 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 >> n >> d >> t;
	for (int i = 0; i < n; i++) cin >> vals[i];
	ld mn = 0;
	ld mx = n;
	for (int t = 0; t < iters; t++) {
		bool fin = make_iter(mn, mx);
		if (fin) return 0;
	}
	assert(false);
}
# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 452 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -