This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define NORTH 0
#define SOUTH 1
#define EAST 2
#define WEST 3
using namespace std;
const int N = 5e4 + 5;
struct Node {
int x, y;
int val;
int dir;
int dist;
bool operator<(const Node& n) const {
return val > n.val;
//return make_tuple(x, y, dir) < make_tuple(n.x, n.y, n.dir);
}
};
int h, w;
int a[N], b[N];
int solve(int x, int y, int dir) {
vector<int> nxt0(w + h + 1, 0);
vector<int> nxt1(w + h + 1, 0);
vector<int> nxt2(w + h + 1, 0);
vector<int> nxt3(w + h + 1, 0);
//unordered_map<pair<int, int>, int, Hasher2> dp;
vector<int> dp1sus(w + h + 1, 0);
vector<int> dp1jos(w + h + 1, 0);
vector<int> dp2st(w + h + 1, 0);
vector<int> dp2dr(w + h + 1, 0);
int hl, hr, wl, wr;
int ans = 0;
hl = hr = x;
wl = wr = y;
if (dir == 0) hl = max(hl - 1, 1);
else if (dir == 1) hr = min(hr + 1, h);
else if (dir == 2) wr = min(wr + 1, w);
else wl = max(wl - 1, 1);
priority_queue<Node> pq;
pq.push({x, y, 0, dir, 0});
while (!pq.empty()) {
auto n = pq.top();
//cout << n.x << " " << n.y << " " << n.dir << " " << n.dist << endl;
pq.pop();
ans = max(ans, n.dist);
//if (n.dir == NORTH && n.x == 1)
// continue;
//if (n.dir == SOUTH && n.x == h)
// continue;
// if (n.dir == EAST && n.y == w)
// continue;
//if (n.dir == WEST && n.y == 1)
// continue;
if (n.dir == NORTH) {
if (nxt0[n.y] != 0) {
} else {
while (hl > 1 && a[hl] <= b[n.y])
--hl;
if (a[hl] <= b[n.y]) {
ans = max(ans, n.dist + n.x - hl);
continue;
}
nxt0[n.y] = hl;
}
pair<int, int> urm = {nxt0[n.y], n.y};
if (dp1sus[n.y] >= n.dist + n.x - urm.first)
continue;
dp1sus[n.y] = n.dist + n.x - urm.first;
pq.push({urm.first, urm.second, a[urm.first], WEST, n.dist + n.x - urm.first});
pq.push({urm.first, urm.second, a[urm.first], EAST, n.dist + n.x - urm.first});
} else if (n.dir == SOUTH) {
if (nxt1[n.y] == 0) {
while (hr < h && a[hr] <= b[n.y])
++hr;
if (a[hr] <= b[n.y]) {
ans = max(ans, n.dist + hr - n.x);
continue;
}
nxt1[n.y] = hr;
}
pair<int, int> urm = {nxt1[n.y], n.y};
if (dp1jos[n.y] >= n.dist + urm.first - n.x)
continue;
dp1jos[n.y] = n.dist + urm.first - n.x;
pq.push({urm.first, urm.second, a[urm.first], WEST, n.dist + urm.first - n.x});
pq.push({urm.first, urm.second, a[urm.first], EAST, n.dist + urm.first - n.x});
} else if (n.dir == EAST) {
if (nxt2[n.x] == 0) {
while (wr < w && b[wr] <= a[n.x])
++wr;
if (b[wr] <= a[n.x]) {
ans = max(ans, n.dist + wr - n.y);
continue;
}
nxt2[n.x] = wr;
}
pair<int, int> urm = {n.x, nxt2[n.x]};
if (dp2dr[n.x] >= n.dist + urm.second - n.y)
continue;
dp2dr[n.x] = n.dist + urm.second - n.y;
pq.push({urm.first, urm.second, b[urm.second], NORTH, n.dist + urm.second - n.y});
pq.push({urm.first, urm.second, b[urm.second], SOUTH, n.dist + urm.second - n.y});
} else {
if (nxt3[n.x] == 0) {
while (wl > 1 && b[wl] <= a[n.x])
--wl;
if (b[wl] <= a[n.x]) {
ans = max(ans, n.dist + n.y - wl);
continue;
}
nxt3[n.x] = wl;
}
pair<int, int> urm = {n.x, nxt3[n.x]};
if (dp2st[n.x] >= n.dist + n.y - urm.second)
continue;
dp2st[n.x] = n.dist + n.y - urm.second;
pq.push({urm.first, urm.second, b[urm.second], NORTH, n.dist + n.y - urm.second});
pq.push({urm.first, urm.second, b[urm.second], SOUTH, n.dist + n.y - urm.second});
}
}
return ans;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr), cout.tie(nullptr);
int q;
cin >> h >> w >> q;
for (int i = 1; i <= h; ++i)
cin >> a[i];
for (int i = 1; i <= w; ++i)
cin >> b[i];
while (q--) {
int x, y;
cin >> x >> y;
int ans = 0;
for (int i = 0; i < 4; ++i)
ans = max(ans, solve(x, y, i));
cout << ans << "\n";
}
return 0;
}
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