oj.uz

Submission #500032

# Submission time Handle Problem Language Result Execution time Memory
500032 2021-12-30T09:44:07 Z Nartifact Mecho (IOI09_mecho) C++14
84 / 100
 177 ms 7832 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define forinc(i,a,b) for(int i=a;i<=b;++i)
#define fordec(i,a,b) for(int i=a;i>=b;--i)
#define pb push_back
#define eb emplace_back
#define pii pair <int,int>
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int N = 888, inf = 1e15;
const int H[] = {1, 0, -1, 0};
const int C[] = {0, 1, 0, -1};
int n, s, cti = inf;
char a[N][N];
int t[N][N];
bool cx[N][N];
pii sta, fin;

bool valid (const int& x, const int& y)
{
    return x && y && x <= n && y <= n
          && a[x][y] != 'T';
}

struct adt {int x, y, step;};

bool ok (const int& tg)
{
    queue <adt> q;
    forinc(i,1,n) forinc(j,1,n) cx[i][j] = 0;
    q.push({sta.fi, sta.se, 0});
    cx[sta.fi][sta.se] = 1;
    while(q.size()) {
        auto tmp = q.front(); q.pop();
        if(tmp.x == fin.fi && tmp.y == fin.se) return 1;
        forinc(i,0,3) {
            int nh = tmp.x + H[i];
            int nc = tmp.y + C[i];
            if(valid(nh, nc) && !cx[nh][nc] && (tmp.step + 1) / s < t[nh][nc] - tg) {
                q.push({nh, nc, tmp.step + 1});
                cx[nh][nc] = 1;
            }
        }
    }
    return 0;
}

void solve ()
{
    queue <pii> q;
    forinc(i,1,n) forinc(j,1,n) {
        t[i][j] = inf;
        if(a[i][j] == 'H') {
            q.push({i, j});
            t[i][j] = 0;
        }
        else if(a[i][j] == 'M') sta = {i, j};
        else if(a[i][j] == 'D') fin = {i, j};
    }

    // bfs bee
    while(q.size()) {
        auto x = q.front(); q.pop();
        forinc(i,0,3) {
            int nh = x.fi + H[i];
            int nc = x.se + C[i];
            if(valid(nh, nc) && t[nh][nc] > t[x.fi][x.se] + 1) {
                t[nh][nc] = t[x.fi][x.se] + 1;
                q.push({nh, nc});
            }
        }
    }
	t[fin.fi][fin.se] = inf;
    // binary search
    int l = 0, r = n * n, ans = -1;
    while(l <= r) {
        int mid = l + r >> 1;
        if(ok(mid)) {
            ans = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    cout << ans;
}

void read ()
{
    cin >> n >> s;
    forinc(i,1,n) forinc(j,1,n)
        cin >> a[i][j];
    solve();
}

main ()
{
	#define task "ioi09_mecho"
	cin.tie(0) -> sync_with_stdio(0);
	if(fopen (task ".inp", "r")) {
		freopen (task ".inp", "r", stdin);
		freopen (task ".out", "w", stdout);
	}
    read();
	return 0;
}

Compilation message

mecho.cpp: In function 'void solve()':
mecho.cpp:83:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   83 |         int mid = l + r >> 1;
      |                   ~~^~~
mecho.cpp: At global scope:
mecho.cpp:101:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  101 | main ()
      | ^~~~
mecho.cpp: In function 'int main()':
mecho.cpp:106:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |   freopen (task ".inp", "r", stdin);
      |   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:107:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |   freopen (task ".out", "w", stdout);
      |   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 83 ms 7484 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 0 ms 292 KB Output is correct
12 Incorrect 1 ms 588 KB Output isn't correct
13 Incorrect 1 ms 588 KB Output isn't correct
14 Correct 1 ms 588 KB Output is correct
15 Correct 0 ms 332 KB Output is correct
16 Correct 0 ms 332 KB Output is correct
17 Correct 0 ms 460 KB Output is correct
18 Correct 1 ms 460 KB Output is correct
19 Correct 0 ms 460 KB Output is correct
20 Correct 0 ms 460 KB Output is correct
21 Correct 0 ms 460 KB Output is correct
22 Correct 0 ms 460 KB Output is correct
23 Correct 1 ms 588 KB Output is correct
24 Correct 1 ms 588 KB Output is correct
25 Correct 1 ms 588 KB Output is correct
26 Correct 1 ms 588 KB Output is correct
27 Correct 1 ms 716 KB Output is correct
28 Correct 1 ms 716 KB Output is correct
29 Correct 1 ms 716 KB Output is correct
30 Correct 1 ms 716 KB Output is correct
31 Correct 1 ms 716 KB Output is correct
32 Correct 1 ms 716 KB Output is correct
33 Correct 5 ms 3276 KB Output is correct
34 Correct 4 ms 3276 KB Output is correct
35 Correct 19 ms 3276 KB Output is correct
36 Correct 5 ms 3788 KB Output is correct
37 Correct 8 ms 3788 KB Output is correct
38 Correct 25 ms 3712 KB Output is correct
39 Correct 7 ms 4172 KB Output is correct
40 Correct 7 ms 4172 KB Output is correct
41 Correct 32 ms 4248 KB Output is correct
42 Correct 7 ms 4556 KB Output is correct
43 Correct 7 ms 4556 KB Output is correct
44 Correct 43 ms 4668 KB Output is correct
45 Correct 9 ms 5068 KB Output is correct
46 Correct 9 ms 5068 KB Output is correct
47 Correct 46 ms 5068 KB Output is correct
48 Correct 10 ms 5452 KB Output is correct
49 Correct 10 ms 5452 KB Output is correct
50 Correct 58 ms 5540 KB Output is correct
51 Correct 14 ms 5964 KB Output is correct
52 Correct 12 ms 5964 KB Output is correct
53 Correct 69 ms 5992 KB Output is correct
54 Correct 14 ms 6308 KB Output is correct
55 Correct 14 ms 6348 KB Output is correct
56 Correct 84 ms 6536 KB Output is correct
57 Correct 16 ms 6832 KB Output is correct
58 Correct 17 ms 6860 KB Output is correct
59 Correct 96 ms 6840 KB Output is correct
60 Correct 18 ms 7280 KB Output is correct
61 Correct 17 ms 7188 KB Output is correct
62 Correct 116 ms 7292 KB Output is correct
63 Correct 91 ms 7216 KB Output is correct
64 Correct 177 ms 7268 KB Output is correct
65 Correct 138 ms 7272 KB Output is correct
66 Correct 111 ms 7268 KB Output is correct
67 Correct 103 ms 7244 KB Output is correct
68 Correct 44 ms 7236 KB Output is correct
69 Correct 44 ms 7428 KB Output is correct
70 Correct 35 ms 7212 KB Output is correct
71 Correct 38 ms 7236 KB Output is correct
72 Incorrect 28 ms 7268 KB Output isn't correct
73 Incorrect 37 ms 7832 KB Output isn't correct
74 Correct 52 ms 7820 KB Output is correct
75 Correct 71 ms 7828 KB Output is correct
76 Correct 55 ms 7784 KB Output is correct
77 Correct 56 ms 7824 KB Output is correct
78 Correct 67 ms 7680 KB Output is correct
79 Correct 43 ms 7656 KB Output is correct
80 Correct 54 ms 7760 KB Output is correct
81 Correct 65 ms 7728 KB Output is correct
82 Correct 55 ms 7764 KB Output is correct
83 Correct 70 ms 7676 KB Output is correct
84 Correct 63 ms 7676 KB Output is correct
85 Correct 69 ms 7632 KB Output is correct
86 Correct 68 ms 7688 KB Output is correct
87 Correct 67 ms 7696 KB Output is correct
88 Correct 72 ms 7540 KB Output is correct
89 Correct 77 ms 7548 KB Output is correct
90 Correct 83 ms 7580 KB Output is correct
91 Correct 73 ms 7568 KB Output is correct
92 Correct 81 ms 7528 KB Output is correct