oj.uz

Submission #724837

# Submission time Handle Problem Language Result Execution time Memory
724837 2023-04-16T04:24:10 Z chanhchuong123 Mecho (IOI09_mecho) C++14
100 / 100
 190 ms 6220 KB 
#include <bits/stdc++.h>
using namespace std;
#define task ""
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i, a, b) for (int i = (b), _a = (a); i >= _a; --i)

template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}

const int dx[] = {-1, 0, 0, +1};
const int dy[] = {0, -1, +1, 0};

const int MAX = 800;
int n, S;
int xM, yM;
int xD, yD;
char a[MAX][MAX];
int bee[MAX][MAX];
int bear[MAX][MAX];
queue<pair<int, int>> q;

bool ok(int add) {
    if (bee[xM][yM] <= add) return false;
    memset(bear, -1, sizeof bear);
    q.push({xM, yM});
    bear[xM][yM] = 0;
    while (q.size()) {
        int u = q.front().fi;
        int v = q.front().se;
        q.pop();

        for (int i = 0; i < 4; ++i) {
            int x = u + dx[i], y = v + dy[i];
            if (x < 0 || x >= n) continue;
            if (y < 0 || y >= n) continue;
            if (a[x][y] == 'M' || a[x][y] == 'G') {
                int candidate = bear[u][v] + 1;
                if (candidate / S < bee[x][y] - add) {
                    if (bear[x][y] == -1) {
                        q.push({x, y});
                        bear[x][y] = candidate;
                    }
                }
            }
        }
    }
    for (int i = 0; i < 4; ++i) {
        int x = xD + dx[i], y = yD + dy[i];
        if (x < 0 || x >= n) continue;
        if (y < 0 || y >= n) continue;
        if (bear[x][y] == -1) continue;
        if (a[x][y] == 'G' || a[x][y] == 'M') {
            if (bear[x][y] / S < bee[x][y] - add) return true;
        }
    }
    return false;
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}

    cin >> n >> S;
    memset(bee, -1, sizeof bee);
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            cin >> a[i][j];
            if (a[i][j] == 'H') {
                bee[i][j] = 0;
                q.push({i, j});
            }
            if (a[i][j] == 'D') {
                xD = i, yD = j;
            }
            if (a[i][j] == 'M') {
                xM = i, yM = j;
            }
        }
    }
    //
    while (q.size()) {
        int u = q.front().fi;
        int v = q.front().se;
        q.pop();

        for (int i = 0; i < 4; ++i) {
            int x = u + dx[i], y = v + dy[i];
            if (x < 0 || x >= n) continue;
            if (y < 0 || y >= n) continue;
            if (a[x][y] == 'G' || a[x][y] == 'M') {
                if (bee[x][y] == -1) {
                    q.push({x, y});
                    bee[x][y] = bee[u][v] + 1;
                }
            }
        }
    }
    //
    int l = 0;
	int r = n * n;
	while (l <= r) {
        int mid = l + r >> 1;
        if (ok(mid)) l = mid + 1;
        else r = mid - 1;
	}
	cout << l - 1;
	return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:115:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  115 |         int mid = l + r >> 1;
      |                   ~~^~~
mecho.cpp:72:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:73:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5204 KB Output is correct
2 Correct 2 ms 5332 KB Output is correct
3 Correct 2 ms 5332 KB Output is correct
4 Correct 3 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 2 ms 5332 KB Output is correct
7 Correct 136 ms 6000 KB Output is correct
8 Correct 3 ms 5332 KB Output is correct
9 Correct 3 ms 5332 KB Output is correct
10 Correct 2 ms 5332 KB Output is correct
11 Correct 3 ms 5332 KB Output is correct
12 Correct 3 ms 5332 KB Output is correct
13 Correct 3 ms 5332 KB Output is correct
14 Correct 3 ms 5332 KB Output is correct
15 Correct 3 ms 5332 KB Output is correct
16 Correct 3 ms 5332 KB Output is correct
17 Correct 3 ms 5332 KB Output is correct
18 Correct 3 ms 5252 KB Output is correct
19 Correct 3 ms 5332 KB Output is correct
20 Correct 3 ms 5284 KB Output is correct
21 Correct 3 ms 5332 KB Output is correct
22 Correct 3 ms 5332 KB Output is correct
23 Correct 3 ms 5332 KB Output is correct
24 Correct 3 ms 5332 KB Output is correct
25 Correct 3 ms 5276 KB Output is correct
26 Correct 4 ms 5376 KB Output is correct
27 Correct 4 ms 5332 KB Output is correct
28 Correct 4 ms 5332 KB Output is correct
29 Correct 3 ms 5332 KB Output is correct
30 Correct 4 ms 5332 KB Output is correct
31 Correct 3 ms 5328 KB Output is correct
32 Correct 3 ms 5332 KB Output is correct
33 Correct 7 ms 5544 KB Output is correct
34 Correct 7 ms 5588 KB Output is correct
35 Correct 28 ms 5612 KB Output is correct
36 Correct 7 ms 5588 KB Output is correct
37 Correct 12 ms 5648 KB Output is correct
38 Correct 48 ms 5628 KB Output is correct
39 Correct 10 ms 5620 KB Output is correct
40 Correct 11 ms 5588 KB Output is correct
41 Correct 51 ms 5692 KB Output is correct
42 Correct 11 ms 5716 KB Output is correct
43 Correct 12 ms 5704 KB Output is correct
44 Correct 64 ms 5716 KB Output is correct
45 Correct 12 ms 5716 KB Output is correct
46 Correct 13 ms 5760 KB Output is correct
47 Correct 74 ms 5852 KB Output is correct
48 Correct 14 ms 5716 KB Output is correct
49 Correct 19 ms 5728 KB Output is correct
50 Correct 76 ms 5716 KB Output is correct
51 Correct 20 ms 5844 KB Output is correct
52 Correct 17 ms 5776 KB Output is correct
53 Correct 100 ms 5776 KB Output is correct
54 Correct 21 ms 5812 KB Output is correct
55 Correct 24 ms 5820 KB Output is correct
56 Correct 126 ms 5836 KB Output is correct
57 Correct 19 ms 5844 KB Output is correct
58 Correct 22 ms 5848 KB Output is correct
59 Correct 132 ms 5912 KB Output is correct
60 Correct 23 ms 5880 KB Output is correct
61 Correct 24 ms 5888 KB Output is correct
62 Correct 178 ms 5948 KB Output is correct
63 Correct 100 ms 5940 KB Output is correct
64 Correct 190 ms 5940 KB Output is correct
65 Correct 154 ms 5936 KB Output is correct
66 Correct 117 ms 5836 KB Output is correct
67 Correct 108 ms 5844 KB Output is correct
68 Correct 51 ms 5964 KB Output is correct
69 Correct 46 ms 5912 KB Output is correct
70 Correct 37 ms 5976 KB Output is correct
71 Correct 39 ms 5924 KB Output is correct
72 Correct 28 ms 5964 KB Output is correct
73 Correct 35 ms 6168 KB Output is correct
74 Correct 67 ms 6152 KB Output is correct
75 Correct 86 ms 6096 KB Output is correct
76 Correct 71 ms 6216 KB Output is correct
77 Correct 77 ms 6148 KB Output is correct
78 Correct 86 ms 6164 KB Output is correct
79 Correct 52 ms 6100 KB Output is correct
80 Correct 66 ms 6188 KB Output is correct
81 Correct 76 ms 6220 KB Output is correct
82 Correct 70 ms 6148 KB Output is correct
83 Correct 106 ms 6152 KB Output is correct
84 Correct 84 ms 6096 KB Output is correct
85 Correct 91 ms 6100 KB Output is correct
86 Correct 95 ms 6052 KB Output is correct
87 Correct 111 ms 6152 KB Output is correct
88 Correct 95 ms 6056 KB Output is correct
89 Correct 96 ms 6092 KB Output is correct
90 Correct 105 ms 6100 KB Output is correct
91 Correct 101 ms 6164 KB Output is correct
92 Correct 120 ms 6092 KB Output is correct