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Submission #1020092

# Submission time Handle Problem Language Result Execution time Memory
1020092 2024-07-11T14:23:25 Z parentoni Mecho (IOI09_mecho) C++17
84 / 100
 194 ms 11656 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, 1e12, 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 5468 KB Output is correct
5 Correct 1 ms 5468 KB Output is correct
6 Correct 1 ms 5468 KB Output is correct
7 Correct 113 ms 11420 KB Output is correct
8 Correct 2 ms 5468 KB Output is correct
9 Correct 2 ms 5468 KB Output is correct
10 Correct 2 ms 5468 KB Output is correct
11 Correct 2 ms 5328 KB Output is correct
12 Incorrect 2 ms 5468 KB Output isn't correct
13 Incorrect 1 ms 5468 KB Output isn't correct
14 Correct 2 ms 5468 KB Output is correct
15 Correct 1 ms 5468 KB Output is correct
16 Correct 1 ms 5468 KB Output is correct
17 Correct 1 ms 5468 KB Output is correct
18 Correct 2 ms 5484 KB Output is correct
19 Correct 2 ms 5284 KB Output is correct
20 Correct 1 ms 5340 KB Output is correct
21 Correct 2 ms 5468 KB Output is correct
22 Correct 1 ms 5468 KB Output is correct
23 Correct 1 ms 5468 KB Output is correct
24 Correct 2 ms 5464 KB Output is correct
25 Correct 1 ms 5360 KB Output is correct
26 Correct 2 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 5336 KB Output is correct
30 Correct 2 ms 5468 KB Output is correct
31 Correct 2 ms 5464 KB Output is correct
32 Correct 2 ms 5468 KB Output is correct
33 Correct 12 ms 6596 KB Output is correct
34 Correct 14 ms 6600 KB Output is correct
35 Correct 24 ms 6612 KB Output is correct
36 Correct 17 ms 6948 KB Output is correct
37 Correct 16 ms 6952 KB Output is correct
38 Correct 32 ms 6960 KB Output is correct
39 Correct 20 ms 7440 KB Output is correct
40 Correct 21 ms 7460 KB Output is correct
41 Correct 41 ms 7440 KB Output is correct
42 Correct 26 ms 7912 KB Output is correct
43 Correct 30 ms 7864 KB Output is correct
44 Correct 53 ms 7872 KB Output is correct
45 Correct 30 ms 8352 KB Output is correct
46 Correct 29 ms 8364 KB Output is correct
47 Correct 63 ms 8312 KB Output is correct
48 Correct 40 ms 8828 KB Output is correct
49 Correct 36 ms 8876 KB Output is correct
50 Correct 74 ms 8940 KB Output is correct
51 Correct 41 ms 9536 KB Output is correct
52 Correct 41 ms 9512 KB Output is correct
53 Correct 86 ms 9432 KB Output is correct
54 Correct 50 ms 10172 KB Output is correct
55 Correct 52 ms 10044 KB Output is correct
56 Correct 100 ms 10108 KB Output is correct
57 Correct 56 ms 11004 KB Output is correct
58 Correct 61 ms 10976 KB Output is correct
59 Correct 115 ms 10788 KB Output is correct
60 Correct 69 ms 11524 KB Output is correct
61 Correct 64 ms 11536 KB Output is correct
62 Correct 136 ms 11404 KB Output is correct
63 Correct 136 ms 11424 KB Output is correct
64 Correct 184 ms 11328 KB Output is correct
65 Correct 194 ms 11348 KB Output is correct
66 Correct 142 ms 11464 KB Output is correct
67 Correct 133 ms 11380 KB Output is correct
68 Correct 88 ms 11432 KB Output is correct
69 Correct 104 ms 11380 KB Output is correct
70 Correct 76 ms 11500 KB Output is correct
71 Correct 78 ms 11424 KB Output is correct
72 Incorrect 95 ms 11408 KB Output isn't correct
73 Incorrect 96 ms 11496 KB Output isn't correct
74 Correct 93 ms 11656 KB Output is correct
75 Correct 109 ms 11484 KB Output is correct
76 Correct 90 ms 11492 KB Output is correct
77 Correct 93 ms 11476 KB Output is correct
78 Correct 107 ms 11468 KB Output is correct
79 Correct 98 ms 11452 KB Output is correct
80 Correct 92 ms 11424 KB Output is correct
81 Correct 98 ms 11508 KB Output is correct
82 Correct 95 ms 11412 KB Output is correct
83 Correct 107 ms 11436 KB Output is correct
84 Correct 99 ms 11372 KB Output is correct
85 Correct 98 ms 11488 KB Output is correct
86 Correct 105 ms 11544 KB Output is correct
87 Correct 102 ms 11484 KB Output is correct
88 Correct 109 ms 11488 KB Output is correct
89 Correct 108 ms 11512 KB Output is correct
90 Correct 116 ms 11568 KB Output is correct
91 Correct 101 ms 11476 KB Output is correct
92 Correct 126 ms 11468 KB Output is correct