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Submission #1020097

# Submission time Handle Problem Language Result Execution time Memory
1020097 2024-07-11T14:34:26 Z parentoni Mecho (IOI09_mecho) C++17
84 / 100
 266 ms 11704 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] && db[x][y] != -1) 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 1 ms 5468 KB Output is correct
2 Correct 1 ms 5468 KB Output is correct
3 Correct 1 ms 5468 KB Output is correct
4 Correct 1 ms 5448 KB Output is correct
5 Correct 2 ms 5468 KB Output is correct
6 Correct 1 ms 5464 KB Output is correct
7 Correct 141 ms 11384 KB Output is correct
8 Correct 1 ms 5464 KB Output is correct
9 Correct 1 ms 5468 KB Output is correct
10 Correct 1 ms 5468 KB Output is correct
11 Correct 1 ms 5468 KB Output is correct
12 Incorrect 1 ms 5464 KB Output isn't correct
13 Incorrect 1 ms 5468 KB Output isn't correct
14 Correct 1 ms 5468 KB Output is correct
15 Correct 1 ms 5468 KB Output is correct
16 Correct 1 ms 5336 KB Output is correct
17 Correct 1 ms 5468 KB Output is correct
18 Correct 2 ms 5468 KB Output is correct
19 Correct 1 ms 5468 KB Output is correct
20 Correct 2 ms 5468 KB Output is correct
21 Correct 1 ms 5468 KB Output is correct
22 Correct 1 ms 5468 KB Output is correct
23 Correct 1 ms 5264 KB Output is correct
24 Correct 1 ms 5468 KB Output is correct
25 Correct 1 ms 5468 KB Output is correct
26 Correct 1 ms 5468 KB Output is correct
27 Correct 2 ms 5468 KB Output is correct
28 Correct 1 ms 5468 KB Output is correct
29 Correct 2 ms 5468 KB Output is correct
30 Correct 2 ms 5340 KB Output is correct
31 Correct 1 ms 5468 KB Output is correct
32 Correct 2 ms 5468 KB Output is correct
33 Correct 17 ms 6788 KB Output is correct
34 Correct 17 ms 6600 KB Output is correct
35 Correct 30 ms 6788 KB Output is correct
36 Correct 23 ms 7128 KB Output is correct
37 Correct 21 ms 7124 KB Output is correct
38 Correct 37 ms 6952 KB Output is correct
39 Correct 28 ms 7520 KB Output is correct
40 Correct 27 ms 7512 KB Output is correct
41 Correct 46 ms 7344 KB Output is correct
42 Correct 32 ms 7932 KB Output is correct
43 Correct 43 ms 7904 KB Output is correct
44 Correct 57 ms 7980 KB Output is correct
45 Correct 42 ms 8340 KB Output is correct
46 Correct 42 ms 8404 KB Output is correct
47 Correct 71 ms 8424 KB Output is correct
48 Correct 49 ms 8992 KB Output is correct
49 Correct 50 ms 8836 KB Output is correct
50 Correct 86 ms 8964 KB Output is correct
51 Correct 57 ms 9680 KB Output is correct
52 Correct 75 ms 9656 KB Output is correct
53 Correct 104 ms 9496 KB Output is correct
54 Correct 67 ms 10132 KB Output is correct
55 Correct 69 ms 10156 KB Output is correct
56 Correct 123 ms 10088 KB Output is correct
57 Correct 78 ms 10788 KB Output is correct
58 Correct 78 ms 10720 KB Output is correct
59 Correct 150 ms 10884 KB Output is correct
60 Correct 116 ms 11340 KB Output is correct
61 Correct 85 ms 11452 KB Output is correct
62 Correct 157 ms 11452 KB Output is correct
63 Correct 158 ms 11396 KB Output is correct
64 Correct 220 ms 11652 KB Output is correct
65 Correct 266 ms 11360 KB Output is correct
66 Correct 192 ms 11428 KB Output is correct
67 Correct 163 ms 11408 KB Output is correct
68 Correct 110 ms 11432 KB Output is correct
69 Correct 141 ms 11448 KB Output is correct
70 Correct 143 ms 11704 KB Output is correct
71 Correct 112 ms 11528 KB Output is correct
72 Incorrect 109 ms 11416 KB Output isn't correct
73 Incorrect 124 ms 11556 KB Output isn't correct
74 Correct 118 ms 11468 KB Output is correct
75 Correct 126 ms 11540 KB Output is correct
76 Correct 115 ms 11600 KB Output is correct
77 Correct 118 ms 11552 KB Output is correct
78 Correct 133 ms 11508 KB Output is correct
79 Correct 118 ms 11484 KB Output is correct
80 Correct 124 ms 11516 KB Output is correct
81 Correct 123 ms 11456 KB Output is correct
82 Correct 118 ms 11456 KB Output is correct
83 Correct 130 ms 11504 KB Output is correct
84 Correct 151 ms 11440 KB Output is correct
85 Correct 136 ms 11380 KB Output is correct
86 Correct 133 ms 11512 KB Output is correct
87 Correct 133 ms 11436 KB Output is correct
88 Correct 128 ms 11404 KB Output is correct
89 Correct 137 ms 11436 KB Output is correct
90 Correct 160 ms 11440 KB Output is correct
91 Correct 136 ms 11516 KB Output is correct
92 Correct 133 ms 11704 KB Output is correct