#include "jumps.h"
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
const int maxn = 1 << 20;
struct segTreeMax {
pair<int, int> tree[maxn];
void build(int i, int l, int r, vector<int> & h) {
if (l + 1 == r) {
tree[i] = { h[l], l };
return;
}
int m = (l + r) / 2;
build(i * 2 + 1, l, m, h);
build(i * 2 + 2, m, r, h);
tree[i] = max(tree[i * 2 + 1], tree[i * 2 + 2]);
}
pair<int, int> get(int i, int l, int r, int ql, int qr) {
if (qr <= l || r <= ql) {
return { -1, -1 };
}
if (ql <= l && r <= qr) {
return tree[i];
}
int m = (l + r) / 2;
return max(get(i * 2 + 1, l, m, ql, qr), get(i * 2 + 2, m, r, ql, qr));
}
};
struct segTreeMin {
pair<int, int> tree[maxn];
void build(int i, int l, int r, vector<int> & h) {
if (l + 1 == r) {
tree[i] = { h[l], l };
return;
}
int m = (l + r) / 2;
build(i * 2 + 1, l, m, h);
build(i * 2 + 2, m, r, h);
tree[i] = min(tree[i * 2 + 1], tree[i * 2 + 2]);
}
pair<int, int> get(int i, int l, int r, int ql, int qr) {
if (qr <= l || r <= ql) {
return { 1e9, -1 };
}
if (ql <= l && r <= qr) {
return tree[i];
}
int m = (l + r) / 2;
return min(get(i * 2 + 1, l, m, ql, qr), get(i * 2 + 2, m, r, ql, qr));
}
};
struct mst {
vector<int> tree[maxn];
void build(int i, int l, int r, int* h) {
if (l + 1 == r) {
tree[i] = { h[l] };
return;
}
int m = (l + r) / 2;
build(i * 2 + 1, l, m, h);
build(i * 2 + 2, m, r, h);
tree[i].resize(tree[i * 2 + 1].size() + tree[i * 2 + 2].size());
merge(tree[i * 2 + 1].begin(), tree[i * 2 + 1].end(), tree[i * 2 + 2].begin(), tree[i * 2 + 2].end(), tree[i].begin());
}
int get(int i, int l, int r, int ql, int qr, int x) {
if (qr <= l || r <= ql) {
return -1e9;
}
if (ql <= l && r <= qr) {
if (tree[i][0] > x) {
return -1e9;
}
return *(--upper_bound(tree[i].begin(), tree[i].end(), x));
}
int m = (l + r) / 2;
return max(get(i * 2 + 1, l, m, ql, qr, x), get(i * 2 + 2, m, r, ql, qr, x));
}
};
segTreeMax st;
segTreeMin st1;
mst st2;
mst st3;
int upRight[20][maxn];
int upLeft[20][maxn];
vector<int> gLeft[maxn];
vector<int> gRight[maxn];
int hLeft[maxn];
int hRight[maxn];
int n;
void dfsLeft(int v, vector<bool> &used, int h) {
used[v] = 1;
hLeft[v] = h;
for (int u : gLeft[v]) {
dfsLeft(u, used, h - 1);
}
}
void dfsRight(int v, vector<bool> &used, int h) {
used[v] = 1;
hRight[v] = h;
for (int u : gRight[v]) {
dfsRight(u, used, h - 1);
}
}
void init(int N, std::vector<int> H) {
n = N;
st.build(0, 0, N, H);
st1.build(0, 0, N, H);
int HH[N];
for (int i = 0; i < N; ++i) {
HH[i] = H[i];
}
st3.build(0, 0, N, HH);
vector<pair<int, int>> stk;
for (int i = 0; i < N; ++i) {
while (!stk.empty() && stk.back() < make_pair(H[i], i)) {
stk.pop_back();
}
if (!stk.empty()) {
upLeft[0][i] = stk.back().second;
} else {
upLeft[0][i] = -1;
}
stk.push_back({ H[i], i });
}
stk.clear();
for (int i = N - 1; i >= 0; --i) {
while (!stk.empty() && stk.back() < make_pair(H[i], i)) {
stk.pop_back();
}
if (!stk.empty()) {
upRight[0][i] = stk.back().second;
} else {
upRight[0][i] = -1;
}
stk.push_back({ H[i], i });
}
stk.clear();
for (int j = 1; j < 20; ++j) {
for (int i = N - 1; i >= 0; --i) {
if (upLeft[j - 1][i] != -1) {
upLeft[j][i] = upLeft[j - 1][upLeft[j - 1][i]];
} else {
upLeft[j][i] = -1;
}
if (upRight[j - 1][i] != -1) {
upRight[j][i] = upRight[j - 1][upRight[j - 1][i]];
} else {
upRight[j][i] = -1;
}
}
}
vector<int> in(N, 0);
for (int i = 0; i < N; ++i) {
if (upLeft[0][i] != -1) {
gLeft[upLeft[0][i]].push_back(i);
}
if (upRight[0][i] != -1) {
gRight[i].push_back(upRight[0][i]);
++in[upRight[0][i]];
}
}
vector<bool> usedLeft(N, false);
vector<bool> usedRight(N, false);
for (int i = 0; i < N; ++i) {
if (!usedLeft[i]) {
dfsLeft(i, usedLeft, 0);
}
if (!usedRight[i] && in[i] == 0) {
dfsRight(i, usedRight, 0);
}
}
for (int i = 0; i < N; ++i) {
hRight[i] *= -1;
}
st2.build(0, 0, N, hRight);
}
int fromPointToSegment(int mid, int l, int r) {
int ans = 0;
for (int j = 19; j >= 0; --j) {
if (upRight[j][mid] != -1 && upRight[j][mid] < l) {
ans += (1 << j);
mid = upRight[j][mid];
}
}
mid = upRight[0][mid];
if (mid <= r) {
return ans + 1;
}
return inf;
}
int fromSegmentToPoint(int l, int r, int mid, int v) {
int x = st2.get(0, 0, n, l, r + 1, hRight[mid]);
if (x > hRight[mid]) {
return -1e9;
}
return hRight[mid] - x;
}
const int inf = 1e9;
int minimum_jumps(int A, int B, int C, int D) {
auto [xmid, midpos] = st.get(0, 0, n, B + 1, C);
int xleft = st1.get(0, 0, n, A, B + 1).first;
int xright = st.get(0, 0, n, C, D + 1).first;
if (xright < xmid || xleft > xright) {
return -1;
}
int ans = inf;
for (int i = A; i <= B; ++i) {
ans = min(ans, fromPointToSegment(i, C, D));
}
if (ans == inf) {
return -1;
}
return ans;
}
Compilation message
jumps.cpp: In function 'int fromPointToSegment(int, int, int)':
jumps.cpp:208:12: error: 'inf' was not declared in this scope; did you mean 'int'?
208 | return inf;
| ^~~
| int
