/
q35.cpp
231 lines (196 loc) · 5.56 KB
/
q35.cpp
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#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define pid pair<double, pii>
#define rt2 1.41421
priority_queue<pid, vector <pid>, greater<pid> > pq;
vector < vector <int> > board;
map <pii, double> mp;
map <pii, int> mp1;
int n, m;
double getdis(int stx, int sty, int enx, int eny) {
pid ex;
pq.push(make_pair(0, make_pair(stx, sty)));
int i;
int j;
if (board[stx][sty] == 1) {
return 0;
}
int test;
while (!pq.empty()) {
ex = pq.top();
pq.pop();
mp1.insert(make_pair(ex.second, 1));
mp.erase(ex.second);
i = ex.second.first;
j = ex.second.second;
if ((ex.second.first == enx) && (ex.second.second == eny)) {
return ex.first;
}
if ((j + 1 < m) && (board[i][j + 1] == 0) && (mp1.count(make_pair(i, j+1)) == 0)) {
if (mp.count(make_pair(i, j + 1)) == 0) {
pq.push(make_pair(ex.first + 1, make_pair(i, j+1)));
mp.insert(make_pair(make_pair(i,j + 1),ex.first + 1));
}
else {
test = mp[make_pair(i, j + 1)];
if (test > ex.first + 1) {
pq.push(make_pair(ex.first + 1, make_pair(i, j+1)));
mp[make_pair(i,j+1)] = ex.first + 1;
}
}
}
if (((j + 1 < m) && (i + 1 < n)) && (board[i + 1][j + 1] == 0) && (mp1.count(make_pair(i + 1, j+1)) == 0)) {
if (mp.count(make_pair(i + 1, j + 1)) == 0) {
pq.push(make_pair(ex.first + rt2, make_pair(i + 1, j+1)));
mp.insert(make_pair(make_pair(i + 1,j + 1),ex.first + rt2));
}
else {
test = mp[make_pair(i + 1, j + 1)];
if (test > ex.first + rt2) {
pq.push(make_pair(ex.first + rt2, make_pair(i+1, j+1)));
mp[make_pair(i+1,j+1)] = ex.first + rt2;
}
}
}
if ((i + 1 < n) && (board[i+1][j] == 0) && (mp1.count(make_pair(i + 1, j)) == 0)) {
if (mp.count(make_pair(i + 1, j)) == 0) {
pq.push(make_pair(ex.first + 1, make_pair(i + 1, j)));
mp.insert(make_pair(make_pair(i + 1,j),ex.first + 1));
}
else {
test = mp[make_pair(i + 1, j)];
if (test > ex.first + 1) {
pq.push(make_pair(ex.first + 1, make_pair(i + 1, j)));
mp[make_pair(i+1,j)] = ex.first + 1;
}
}
}
if (((j - 1 >= 0) && (i + 1 < n)) && (board[i + 1][j - 1] == 0) && (mp1.count(make_pair(i + 1, j-1)) == 0)) {
if (mp.count(make_pair(i + 1, j - 1)) == 0) {
pq.push(make_pair(ex.first + rt2, make_pair(i + 1, j-1)));
mp.insert(make_pair(make_pair(i + 1,j - 1),ex.first + rt2));
}
else {
test = mp[make_pair(i + 1, j - 1)];
if (test > ex.first + rt2) {
pq.push(make_pair(ex.first + rt2, make_pair(i+1, j-1)));
mp[make_pair(i+1,j-1)] = ex.first + rt2;
}
}
}
if ((j - 1 >= 0) && (board[i][j - 1] == 0) && (mp1.count(make_pair(i, j-1)) == 0)) {
if (mp.count(make_pair(i, j - 1)) == 0) {
pq.push(make_pair(ex.first + 1, make_pair(i, j - 1)));
mp.insert(make_pair(make_pair(i,j - 1),ex.first + 1));
}
else {
test = mp[make_pair(i, j - 1)];
if (test > ex.first + 1) {
pq.push(make_pair(ex.first + 1, make_pair(i, j - 1)));
mp[make_pair(i,j-1)] = ex.first + 1;
}
}
}
if (((j - 1 >= 0) && (i - 1 >= 0)) && (board[i - 1][j - 1] == 0) && (mp1.count(make_pair(i-1, j-1)) == 0)) {
if (mp.count(make_pair(i - 1, j - 1)) == 0) {
pq.push(make_pair(ex.first + rt2, make_pair(i - 1, j-1)));
mp.insert(make_pair(make_pair(i - 1,j - 1),ex.first + rt2));
}
else {
test = mp[make_pair(i - 1, j - 1)];
if (test > ex.first + rt2) {
pq.push(make_pair(ex.first + rt2, make_pair(i-1, j-1)));
mp[make_pair(i-1,j-1)] = ex.first + rt2;
}
}
}
if ((i - 1 >= 0) && (board[i - 1][j] == 0) && (mp1.count(make_pair(i-1, j)) == 0)) {
if (mp.count(make_pair(i - 1, j)) == 0) {
pq.push(make_pair(ex.first + 1, make_pair(i - 1, j)));
mp.insert(make_pair(make_pair(i - 1,j),ex.first + 1));
}
else {
test = mp[make_pair(i - 1, j)];
if (test > ex.first + 1) {
pq.push(make_pair(ex.first + 1, make_pair(i - 1, j)));
mp[make_pair(i-1,j)] = ex.first + 1;
}
}
}
if (((j + 1 < m) && (i - 1 >= 0)) && (board[i - 1][j + 1] == 0) && (mp1.count(make_pair(i - 1, j+1)) == 0)) {
if (mp.count(make_pair(i - 1, j + 1)) == 0) {
pq.push(make_pair(ex.first + rt2, make_pair(i - 1, j+1)));
mp.insert(make_pair(make_pair(i - 1,j + 1),ex.first + rt2));
}
else {
test = mp[make_pair(i - 1, j + 1)];
if (test > ex.first + rt2) {
pq.push(make_pair(ex.first + rt2, make_pair(i-1, j+1)));
mp[make_pair(i-1,j+1)] = ex.first + rt2;
}
}
}
}
}
int main() {
int tc, i, j,x;
cin >> n >> m;
vector <int> row;
for (i = 0; i < n; i++) {
row.clear();
for (j = 0; j < m; j++) {
cin >> x;
row.push_back(x);
}
board.push_back(row);
}
cin >> tc;
int stx, sty, enx, eny;
while (tc--) {
double sol = 0;
double sol5 = 0;
double sol2 = 0;
double sol3 = 0;
double sol4 = 0;
int sol1;
mp.clear();
mp1.clear();
cin >> stx >> sty;
while (!pq.empty())
pq.pop();
enx = 0;
eny = 0;
sol = getdis(stx, sty, enx, eny);
// cout << sol << endl;
mp.clear();
mp1.clear();
while (!pq.empty())
pq.pop();
enx = 0;
eny = m - 1;
sol2 = getdis(stx, sty, enx, eny);
// cout << sol << endl;
mp.clear();
mp1.clear();
while (!pq.empty())
pq.pop();
enx = n - 1;
eny = m - 1;
sol3 = getdis(stx, sty, enx, eny);
// cout << sol << endl;
mp.clear();
mp1.clear();
while (!pq.empty())
pq.pop();
enx = n - 1;
eny = 0;
sol4 = getdis(stx, sty, enx, eny);
//cout << sol << endl;
mp.clear();
mp1.clear();
sol5 = min(min(sol, sol2), min(sol3, sol4));
cout << (int)(sol5 + 0.5) << "\n";
}
return 0;
}