Submission #1042697

#	Time	Username	Problem	Language	Result	Execution time	Memory
1042697		Soumya1	Comparing Plants (IOI20_plants)	C++17	100 / 100	653 ms	110928 KiB

plants

#include "plants.h"
#include <bits/stdc++.h>
using namespace std;
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
const int mxN = 2e5 + 5;
int t[4 * mxN], lazy[4 * mxN];
void apply(int x, int v) {
	t[x] += v;
	lazy[x] += v;
}
void push(int x, int lx, int rx) {
	if (lx == rx) return;
	apply(x << 1, lazy[x]);
	apply(x << 1 | 1, lazy[x]);
	lazy[x] = 0;
}
void update(int x, int lx, int rx, int l, int r, int v) {
	if (lazy[x]) push(x, lx, rx);
	if (l > rx || lx > r) return;
	if (l <= lx && r >= rx) {
		apply(x, v);
		return;
	}
	int mx = (lx + rx) >> 1;
	update(x << 1, lx, mx, l, r, v);
	update(x << 1 | 1, mx + 1, rx, l, r, v);
	t[x] = min(t[x << 1], t[x << 1 | 1]);
}
int query(int x, int lx, int rx, int l, int r) {
	if (lazy[x]) push(x, lx, rx);
	if (l > rx || lx > r || t[x]) return -1;
	if (lx == rx) return lx;
	int mx = (lx + rx) >> 1;
	int y = query(x << 1, lx, mx, l, r);
	if (y != -1) return y;
	return query(x << 1 | 1, mx + 1, rx, l, r);
}
int min_query(int x, int lx, int rx, int l, int r) {
	if (lazy[x]) push(x, lx, rx);
	if (l > rx || lx > r) return 1e9;
	if (l <= lx && r >= rx) return t[x];
	int mx = (lx + rx) >> 1;
	return min(min_query(x << 1, lx, mx, l, r), min_query(x << 1 | 1, mx + 1, rx, l, r));
}
int val[mxN], pos[mxN], cur;
int n, k;
void dfs(int u) {
	vector<pair<int, int>> ranges;
	if (u >= k + 1) ranges = {{u - k, u - 1}};
	else if (u == 1) ranges = {{n - k + 1, n}};
	else ranges = {{max(1, u - k), u - 1}, {n - k + u, n}};
	for (auto [l, r] : ranges) {
		int idx = query(1, 1, n, l, r);
		while (idx != -1) {
			dfs(idx);
			idx = query(1, 1, n, l, r);
		}
	}
	for (auto [l, r] : ranges) {
		update(1, 1, n, l, r, -1);
	}
	pos[cur] = u;
	val[u] = cur--;
	update(1, 1, n, u, u, 1e9);
}
const int lg = 20;
int L[mxN][lg], R[mxN][lg];
long long sl[mxN][lg], sr[mxN][lg];
void init(int K, vector<int> r) {
	k = K - 1, n = r.size();
	cur = n;
	for (int i = 0; i < n; i++) {
		update(1, 1, n, i + 1, i + 1, r[i]);
	}
	while (true) {
		int i = query(1, 1, n, 1, n);
		if (i != -1) dfs(i);
		else break;
	}
	for (int i = 1; i <= n; i++) {
		update(1, 1, n, i, i, -min_query(1, 1, n, i, i) + 1e9);
	}
	val[0] = n + 1, pos[n + 1] = 0;
	for (int i = n; i >= 1; i--) {
		int p = pos[i];
		int mn = min(min_query(1, 1, n, max(p - k, 1), p - 1), min_query(1, 1, n, min(n - k + p, n + 1), n));
		L[pos[i]][0] = (mn == 1e9 ? 0 : pos[mn]);
		mn = min(min_query(1, 1, n, p + 1, min(n, p + k)), min_query(1, 1, n, 1, p + k - n));
		R[pos[i]][0] = (mn == 1e9 ? 0 : pos[mn]);
		update(1, 1, n, pos[i], pos[i], -1e9 + i);
		sl[pos[i]][0] = (pos[i] - L[pos[i]][0] + n) % n;
		sr[pos[i]][0] = (R[pos[i]][0] - pos[i] + n) % n;
	}
	val[n + 1] = n + 1;
	R[n + 1][0] = n + 1;
	for (int i = 1; i <= n; i++) {
		if (!R[i][0]) R[i][0] = i;
		if (!L[i][0]) L[i][0] = i;
	}
	for (int j = 1; j < lg; j++) {
		for (int i = 0; i <= n + 1; i++) {
			L[i][j] = L[L[i][j - 1]][j - 1];
			R[i][j] = R[R[i][j - 1]][j - 1];
			sl[i][j] = sl[i][j - 1] + sl[L[i][j - 1]][j - 1];
			sr[i][j] = sr[i][j - 1] + sr[R[i][j - 1]][j - 1];
		}
	}
}
bool Lpath(int x, int y) {
	int tot = (x - y + n) % n;
	for (int j = lg - 1; j >= 0; j--) {
		if (sl[x][j] <= tot) {
			tot -= sl[x][j];
			x = L[x][j];
		}
	}
	return (val[x] <= val[y] && (x - y + n) % n <= k);
}
bool Rpath(int x, int y) {
	int tot = (y - x + n) % n;
	for (int j = lg - 1; j >= 0; j--) {
		if (sr[x][j] <= tot) {
			tot -= sr[x][j];
			x = R[x][j];
		}
	}
	return (val[x] <= val[y] && (y - x + n) % n <= k);
}
int compare_plants(int x, int y) {
	x++, y++;
	if (Lpath(x, y) || Rpath(x, y)) return -1;
	if (Lpath(y, x) || Rpath(y, x)) return 1;
	return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 11 / 11
• Subtask 6: 15 / 15
• Subtask 7: 25 / 25