// EXPLOSION!
#define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
#include<unordered_set>
#include<unordered_map>
#include<chrono>
using namespace std;
typedef pair<int, int> pii;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pair<int, int>> vpi;
typedef vector<pair<ll, ll>> vpll;
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
#define pb push_back
#define mp make_pair
#define rsz resize
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define f first
#define s second
#define cont continue
#define endl '\n'
//#define ednl '\n'
#define test int testc;cin>>testc;while(testc--)
#define pr(a, b) trav(x,a)cerr << x << b; cerr << endl;
#define message cout << "Hello World" << endl;
const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 }; // for every grid problem!!
const ll linf = 4000000000000000000LL;
const ll inf = 1000000007;//998244353
void pv(vi a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vll a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vector<vi>a) {
F0R(i, sz(a)) { cout << i << endl; pv(a[i]); cout << endl; }
}void pv(vector<vll>a) { F0R(i, sz(a)) { cout << i << endl; pv(a[i]); }cout << endl; }void pv(vector<string>a) { trav(x, a)cout << x << endl; cout << endl; }
void setIO(string s) {
ios_base::sync_with_stdio(0); cin.tie(0);
if (sz(s))
{
freopen((s + ".in").c_str(), "r", stdin);
if (s != "test1")
freopen((s + ".out").c_str(), "w", stdout);
}
}
int n, m;
const int MAX = 805;
string a[MAX];
int dist[MAX][MAX];
int check(int i, int j)
{
return i >= 0 && j >= 0 && i < n&& j < n&& a[i][j] != 'T';
}
struct T
{
int d, extra;
T next()
{
T t = (*this);
t.extra--;
if (t.extra == -1)
{
t.extra = m;
t.d++;
}
return t;
}
bool operator<(const T& x)const
{
if (d == x.d)return extra > x.extra;
return d < x.d;
}
};
T best[MAX][MAX];
T init = { inf,0 };
pii start, finish;
int solve(int t)
{
F0R(i, n)F0R(j, n)best[i][j] = init;
if (t >= dist[start.f][start.s])return 0;
best[start.f][start.s] = { t,m };
deque<pii>todo = { {start.f,start.s} };
while (sz(todo))
{
int i = todo.back().f, j = todo.back().s;
todo.pop_back();
F0R(k, 4)
{
int x = i + dx[k], y = j + dy[k];
if (check(x, y))
{
T temp = best[i][j];
temp = temp.next();
if (dist[x][y] > temp.d && temp < best[x][y])
{
best[x][y] = temp;
todo.pb({ x,y });
}
}
}
}
return best[finish.f][finish.s].d != inf;
}
int main()
{
setIO("");
cin >> n >> m;
F0R(i, n)cin >> a[i];
F0R(i, n)
{
F0R(j, n)
{
if (a[i][j] == 'M')start = { i,j };
if (a[i][j] == 'D')finish = { i,j };
}
}
F0R(i, n)F0R(j, n)dist[i][j] = inf;
deque<pii> todo;
F0R(i, n)F0R(j, n)if (a[i][j] == 'H')todo.pb({ i,j }), dist[i][j] = 0;
while (sz(todo))
{
int i = todo.back().f, j = todo.back().s;
todo.pop_back();
F0R(k, 4)
{
int x = i + dx[k], y = j + dy[k];
if (check(x, y) && a[x][y] != 'D' && dist[x][y] > dist[i][j] + 1)
{
dist[x][y] = dist[i][j] + 1;
todo.push_front({ x,y });
}
}
}
if (!solve(0))
{
cout << -1 << endl;
return 0;
}
int l = 0, r = 2 * n;
while (l < r)
{
int m = (l + r + 1) / 2;
if (solve(m))
{
l = m;
}
else
{
r = m - 1;
}
}
cout << l << endl;
}
Compilation message
mecho.cpp: In function 'void setIO(std::string)':
mecho.cpp:48:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
48 | freopen((s + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:50:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
50 | freopen((s + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 2 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 4 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 5 |
Correct |
1 ms |
352 KB |
Output is correct |
| 6 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 7 |
Execution timed out |
1098 ms |
9260 KB |
Time limit exceeded |
| 8 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 9 |
Correct |
1 ms |
460 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 11 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 12 |
Incorrect |
1 ms |
740 KB |
Output isn't correct |
| 13 |
Correct |
2 ms |
716 KB |
Output is correct |
| 14 |
Incorrect |
10 ms |
716 KB |
Output isn't correct |
| 15 |
Incorrect |
1 ms |
480 KB |
Output isn't correct |
| 16 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 17 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 18 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 19 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 20 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 21 |
Incorrect |
1 ms |
588 KB |
Output isn't correct |
| 22 |
Incorrect |
1 ms |
592 KB |
Output isn't correct |
| 23 |
Incorrect |
1 ms |
716 KB |
Output isn't correct |
| 24 |
Incorrect |
1 ms |
716 KB |
Output isn't correct |
| 25 |
Incorrect |
1 ms |
716 KB |
Output isn't correct |
| 26 |
Incorrect |
1 ms |
716 KB |
Output isn't correct |
| 27 |
Incorrect |
2 ms |
872 KB |
Output isn't correct |
| 28 |
Incorrect |
1 ms |
844 KB |
Output isn't correct |
| 29 |
Incorrect |
1 ms |
844 KB |
Output isn't correct |
| 30 |
Incorrect |
1 ms |
844 KB |
Output isn't correct |
| 31 |
Incorrect |
3 ms |
844 KB |
Output isn't correct |
| 32 |
Incorrect |
2 ms |
848 KB |
Output isn't correct |
| 33 |
Incorrect |
17 ms |
3908 KB |
Output isn't correct |
| 34 |
Incorrect |
24 ms |
3788 KB |
Output isn't correct |
| 35 |
Execution timed out |
1085 ms |
3988 KB |
Time limit exceeded |
| 36 |
Incorrect |
22 ms |
4472 KB |
Output isn't correct |
| 37 |
Incorrect |
30 ms |
4428 KB |
Output isn't correct |
| 38 |
Execution timed out |
1053 ms |
4616 KB |
Time limit exceeded |
| 39 |
Incorrect |
35 ms |
4996 KB |
Output isn't correct |
| 40 |
Incorrect |
39 ms |
5000 KB |
Output isn't correct |
| 41 |
Execution timed out |
1086 ms |
5196 KB |
Time limit exceeded |
| 42 |
Incorrect |
34 ms |
5576 KB |
Output isn't correct |
| 43 |
Incorrect |
47 ms |
5580 KB |
Output isn't correct |
| 44 |
Execution timed out |
1097 ms |
5796 KB |
Time limit exceeded |
| 45 |
Incorrect |
46 ms |
6092 KB |
Output isn't correct |
| 46 |
Incorrect |
70 ms |
6092 KB |
Output isn't correct |
| 47 |
Execution timed out |
1093 ms |
6440 KB |
Time limit exceeded |
| 48 |
Incorrect |
52 ms |
6732 KB |
Output isn't correct |
| 49 |
Incorrect |
72 ms |
6752 KB |
Output isn't correct |
| 50 |
Execution timed out |
1077 ms |
7068 KB |
Time limit exceeded |
| 51 |
Incorrect |
62 ms |
7348 KB |
Output isn't correct |
| 52 |
Incorrect |
84 ms |
7352 KB |
Output isn't correct |
| 53 |
Execution timed out |
1093 ms |
7884 KB |
Time limit exceeded |
| 54 |
Incorrect |
70 ms |
7884 KB |
Output isn't correct |
| 55 |
Incorrect |
100 ms |
7952 KB |
Output isn't correct |
| 56 |
Execution timed out |
1090 ms |
8564 KB |
Time limit exceeded |
| 57 |
Incorrect |
83 ms |
8524 KB |
Output isn't correct |
| 58 |
Incorrect |
118 ms |
8572 KB |
Output isn't correct |
| 59 |
Execution timed out |
1087 ms |
9240 KB |
Time limit exceeded |
| 60 |
Incorrect |
89 ms |
9164 KB |
Output isn't correct |
| 61 |
Incorrect |
126 ms |
9164 KB |
Output isn't correct |
| 62 |
Execution timed out |
1094 ms |
9944 KB |
Time limit exceeded |
| 63 |
Incorrect |
188 ms |
9196 KB |
Output isn't correct |
| 64 |
Correct |
194 ms |
9148 KB |
Output is correct |
| 65 |
Incorrect |
177 ms |
9196 KB |
Output isn't correct |
| 66 |
Incorrect |
140 ms |
9288 KB |
Output isn't correct |
| 67 |
Incorrect |
185 ms |
9280 KB |
Output isn't correct |
| 68 |
Incorrect |
61 ms |
9184 KB |
Output isn't correct |
| 69 |
Correct |
62 ms |
9156 KB |
Output is correct |
| 70 |
Incorrect |
47 ms |
9164 KB |
Output isn't correct |
| 71 |
Incorrect |
46 ms |
9204 KB |
Output isn't correct |
| 72 |
Correct |
41 ms |
9164 KB |
Output is correct |
| 73 |
Execution timed out |
1045 ms |
9452 KB |
Time limit exceeded |
| 74 |
Execution timed out |
1088 ms |
9452 KB |
Time limit exceeded |
| 75 |
Execution timed out |
1085 ms |
9440 KB |
Time limit exceeded |
| 76 |
Execution timed out |
1082 ms |
9412 KB |
Time limit exceeded |
| 77 |
Execution timed out |
1081 ms |
9440 KB |
Time limit exceeded |
| 78 |
Execution timed out |
1089 ms |
9424 KB |
Time limit exceeded |
| 79 |
Execution timed out |
1087 ms |
10096 KB |
Time limit exceeded |
| 80 |
Execution timed out |
1097 ms |
9416 KB |
Time limit exceeded |
| 81 |
Execution timed out |
1090 ms |
9408 KB |
Time limit exceeded |
| 82 |
Execution timed out |
1091 ms |
9408 KB |
Time limit exceeded |
| 83 |
Execution timed out |
1093 ms |
9412 KB |
Time limit exceeded |
| 84 |
Execution timed out |
1078 ms |
9760 KB |
Time limit exceeded |
| 85 |
Execution timed out |
1098 ms |
9284 KB |
Time limit exceeded |
| 86 |
Execution timed out |
1092 ms |
9284 KB |
Time limit exceeded |
| 87 |
Execution timed out |
1084 ms |
9360 KB |
Time limit exceeded |
| 88 |
Execution timed out |
1088 ms |
9284 KB |
Time limit exceeded |
| 89 |
Execution timed out |
1096 ms |
9900 KB |
Time limit exceeded |
| 90 |
Execution timed out |
1095 ms |
9284 KB |
Time limit exceeded |
| 91 |
Execution timed out |
1083 ms |
9412 KB |
Time limit exceeded |
| 92 |
Execution timed out |
1092 ms |
9320 KB |
Time limit exceeded |
