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 ll long long
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define pii pair < int, int >
#define FIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
using namespace std;
const int N = 6e6;
string mat[N];
int n, m, k;
int r1, s1, r2, s2;
vector < vector < pii > > val;
vector < vector < bool > > vis;
pii nul = mp(-1, 0);
deque < pii > dq;
pii spr1[4] = {mp(1, 0), mp(0, 1), mp(-1, 0), mp(0, -1)};
pii spr2[8] = {mp(1, 0), mp(0, 1), mp(-1, 0), mp(0, -1), mp(1, 1), mp(-1, 1), mp(1, -1), mp(-1, -1)};
void makemat( void ) {
vector < pii > temp;
vector < bool > tempvis;
for(int i = 0; i < m; i++) temp.pb(nul);
for(int i = 0; i < n; i++) val.pb(temp);
for(int i = 0; i < m; i++) tempvis.pb(0);
for(int i = 0; i < n; i++) vis.pb(tempvis);
}
bool inbounds( int a, int b ) {
return (a < 0 || b < 0 || a >= n || b >= m) ? 0 : 1;
}
void upis( void ) {
cin >> n >> m >> k;
cin >> r1 >> s1 >> r2 >> s2;
r1--; s1--;
r2--; s2--;
for(int i = 0; i < n; i++) cin >> mat[i];
return;
}
void solve( void ) {
makemat();
dq.push_back(mp(r1, s1));
val[r1][s1] = mp(0, 0);
pii cur;
pii curspr;
while(!dq.empty()) {
cur = dq.front();
dq.pop_front();
if(!vis[cur.F][cur.S]) {
vis[cur.F][cur.S] = 1;
if(val[cur.F][cur.S].S != 0) {
for(int i = 0; i < 8; i++) {
curspr = spr2[i];
if(inbounds(cur.F + curspr.F, cur.S + curspr.S)) {
if(val[cur.F + curspr.F][cur.S + curspr.S] == nul) {
val[cur.F + curspr.F][cur.S + curspr.S] = mp(val[cur.F][cur.S].F, val[cur.F][cur.S].S - 1);
dq.push_back(mp(cur.F + curspr.F, cur.S + curspr.S));
}
}
}
}
else {
for(int i = 0; i < 4; i++) {
curspr = spr1[i];
if(inbounds(cur.F + curspr.F, cur.S + curspr.S)) {
if(val[cur.F + curspr.F][cur.S + curspr.S] == nul) {
if(mat[cur.F + curspr.F][cur.S + curspr.S] != '#') {
val[cur.F + curspr.F][cur.S + curspr.S] = val[cur.F][cur.S];
dq.push_front(mp(cur.F + curspr.F, cur.S + curspr.S));
}
else {
val[cur.F + curspr.F][cur.S + curspr.S] = mp(val[cur.F][cur.S].F + 1, k - 1);
dq.push_back(mp(cur.F + curspr.F, cur.S + curspr.S));
}
}
}
}
}
}
}
// for(int i = 0; i < n; i++) {
// for(int j = 0; j < m; j++) cout << val[i][j].F << " ";
// cout << "\n";
// }
// cout << "\n";
// for(int i = 0; i < n; i++) {
// for(int j = 0; j < m; j++) cout << val[i][j].S << " ";
// cout << "\n";
// }
// cout << "\n";
cout << val[r2][s2].F << "\n";
return;
}
int main( void ) {
FIO;
upis();
solve();
return 0;
}
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