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Submission #1020095

# Submission time Handle Problem Language Result Execution time Memory
1020095 2024-07-11T14:30:10 Z parentoni Mecho (IOI09_mecho) C++17
84 / 100
 211 ms 11084 KB 
#include <bits/stdc++.h>
using namespace std;

#define all(x) (x).begin(), (x).end()
#define print(x) for (auto el: x) cout << el << " "; cout << '\n'
#define f first
#define s second

using ll = long long;
using llb = long double;
using vl = vector<ll>;
using pll = pair<ll,ll>;

// functions
void setIO(string s) {freopen((s + ".in").c_str(), "r", stdin);freopen((s + ".out").c_str(), "w", stdout);}
void yes() { cout<<"YES\n"; }
void no() { cout<<"NO\n"; }

// geometry
const double PI = 3.14159265358979323846;
double DEG_to_RAD (double d) {return d*PI/180.0;}
double RAD_to_DEG (double r) {return r*180.0/ PI;}

// values
const ll INF = 1e18;
const ll MOD = 1000000007;
const ll MAX_N = 800;

ll dx[4] = {1,-1,0,0}, dy[4] = {0,0,1,-1};

pll m, house;
ll n, s, db[MAX_N][MAX_N]; queue<pll> qb;
bitset<MAX_N> b[MAX_N]; // board;

bool possible(ll min) {

  vector<vl> d(n, vl(n, -1));
  queue<pll> q; q.push(m); d[m.f][m.s] = 0;

  while(q.size()) {
    pll a = q.front(); q.pop();
    for (int i=0;i<4;i++) {
      ll x = a.f + dx[i], y = a.s + dy[i], c = d[a.f][a.s] + 1;
      if (x == house.f && y == house.s) return true;
      if (x < 0 || x >= n || y < 0 || y >= n) continue;
      if (!b[x][y] || d[x][y] != -1) continue;
      if (c/s + min >= db[x][y]) continue;
      d[x][y] = c;
      q.push({x,y});
    }
  }

  return false;
}

ll last_true(ll lo, ll hi, function<bool(ll)> f) {
  ll ans = -1;

  while(lo <= hi) {
    ll med = (hi-lo)/2 + lo;
    if (f(med)) {
      lo = med + 1;
      ans = med;
    } else {
      hi = med - 1;
    }
  }

  return ans;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);

  cin >> n >> s;
  for (auto &row: db) for (auto &el: row) el = -1;

  for (int i=0;i<n;i++) {
    string t; cin >> t;
    for (int j=0;j<n;j++) {
      b[i][j] = t[j] == 'G';
      if (t[j] == 'H') {
        db[i][j] = 0;
        qb.push({i,j});
      }

      if (t[j] == 'M') {
        m = {i,j};
      } 

      if (t[j] == 'D') {
        house = {i,j};
      }
    }
  }

  while(qb.size()) {
    pll a = qb.front(); qb.pop();
    for (int i=0;i<4;i++) {
      ll x = a.f + dx[i], y = a.s + dy[i];
      if (x < 0 || x >= n || y < 0 || y >= n) continue;
      if (!b[x][y] || db[x][y] != -1) continue;
      db[x][y] = db[a.f][a.s]+1;
      qb.push({x,y});
    }
  }

  cout << last_true(0, 1e17, possible) << endl;
}

Compilation message

mecho.cpp: In function 'void setIO(std::string)':
mecho.cpp:15:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 | void setIO(string s) {freopen((s + ".in").c_str(), "r", stdin);freopen((s + ".out").c_str(), "w", stdout);}
      |                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:15:71: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 | void setIO(string s) {freopen((s + ".in").c_str(), "r", stdin);freopen((s + ".out").c_str(), "w", stdout);}
      |                                                                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5464 KB Output is correct
2 Correct 4 ms 5468 KB Output is correct
3 Correct 2 ms 5468 KB Output is correct
4 Correct 2 ms 5468 KB Output is correct
5 Correct 3 ms 5304 KB Output is correct
6 Correct 2 ms 5468 KB Output is correct
7 Correct 160 ms 10796 KB Output is correct
8 Correct 2 ms 5468 KB Output is correct
9 Correct 2 ms 5432 KB Output is correct
10 Correct 3 ms 5464 KB Output is correct
11 Correct 2 ms 5468 KB Output is correct
12 Incorrect 3 ms 5468 KB Output isn't correct
13 Incorrect 3 ms 5468 KB Output isn't correct
14 Correct 4 ms 5468 KB Output is correct
15 Correct 2 ms 5468 KB Output is correct
16 Correct 2 ms 5464 KB Output is correct
17 Correct 2 ms 5468 KB Output is correct
18 Correct 2 ms 5468 KB Output is correct
19 Correct 2 ms 5464 KB Output is correct
20 Correct 2 ms 5468 KB Output is correct
21 Correct 3 ms 5468 KB Output is correct
22 Correct 2 ms 5468 KB Output is correct
23 Correct 2 ms 5468 KB Output is correct
24 Correct 2 ms 5468 KB Output is correct
25 Correct 3 ms 5468 KB Output is correct
26 Correct 2 ms 5468 KB Output is correct
27 Correct 2 ms 5468 KB Output is correct
28 Correct 4 ms 5464 KB Output is correct
29 Correct 2 ms 5464 KB Output is correct
30 Correct 2 ms 5468 KB Output is correct
31 Correct 2 ms 5468 KB Output is correct
32 Correct 3 ms 5468 KB Output is correct
33 Correct 17 ms 6488 KB Output is correct
34 Correct 21 ms 6484 KB Output is correct
35 Correct 28 ms 6684 KB Output is correct
36 Correct 22 ms 6972 KB Output is correct
37 Correct 24 ms 6972 KB Output is correct
38 Correct 38 ms 6968 KB Output is correct
39 Correct 39 ms 7132 KB Output is correct
40 Correct 28 ms 7320 KB Output is correct
41 Correct 49 ms 7324 KB Output is correct
42 Correct 35 ms 7692 KB Output is correct
43 Correct 34 ms 7688 KB Output is correct
44 Correct 73 ms 7688 KB Output is correct
45 Correct 47 ms 8076 KB Output is correct
46 Correct 44 ms 8112 KB Output is correct
47 Correct 73 ms 8084 KB Output is correct
48 Correct 51 ms 8532 KB Output is correct
49 Correct 51 ms 8512 KB Output is correct
50 Correct 98 ms 8664 KB Output is correct
51 Correct 58 ms 9076 KB Output is correct
52 Correct 61 ms 8936 KB Output is correct
53 Correct 102 ms 9156 KB Output is correct
54 Correct 102 ms 9536 KB Output is correct
55 Correct 71 ms 9624 KB Output is correct
56 Correct 121 ms 9612 KB Output is correct
57 Correct 78 ms 10172 KB Output is correct
58 Correct 80 ms 10356 KB Output is correct
59 Correct 144 ms 10232 KB Output is correct
60 Correct 92 ms 10824 KB Output is correct
61 Correct 125 ms 10780 KB Output is correct
62 Correct 183 ms 10904 KB Output is correct
63 Correct 156 ms 10752 KB Output is correct
64 Correct 201 ms 10840 KB Output is correct
65 Correct 211 ms 10936 KB Output is correct
66 Correct 177 ms 10728 KB Output is correct
67 Correct 174 ms 10740 KB Output is correct
68 Correct 142 ms 10724 KB Output is correct
69 Correct 105 ms 10980 KB Output is correct
70 Correct 108 ms 10800 KB Output is correct
71 Correct 105 ms 10772 KB Output is correct
72 Incorrect 125 ms 10760 KB Output isn't correct
73 Incorrect 126 ms 11084 KB Output isn't correct
74 Correct 133 ms 10812 KB Output is correct
75 Correct 122 ms 10948 KB Output is correct
76 Correct 114 ms 10808 KB Output is correct
77 Correct 123 ms 10908 KB Output is correct
78 Correct 130 ms 10972 KB Output is correct
79 Correct 134 ms 10892 KB Output is correct
80 Correct 123 ms 10764 KB Output is correct
81 Correct 123 ms 10816 KB Output is correct
82 Correct 137 ms 10912 KB Output is correct
83 Correct 136 ms 10960 KB Output is correct
84 Correct 134 ms 10860 KB Output is correct
85 Correct 129 ms 10820 KB Output is correct
86 Correct 151 ms 10804 KB Output is correct
87 Correct 155 ms 10752 KB Output is correct
88 Correct 136 ms 10844 KB Output is correct
89 Correct 149 ms 10824 KB Output is correct
90 Correct 150 ms 10940 KB Output is correct
91 Correct 148 ms 10772 KB Output is correct
92 Correct 132 ms 10796 KB Output is correct