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Submission #53469

# Submission time Handle Problem Language Result Execution time Memory
53469 2018-06-30T05:32:16 Z 시제연(#2016) Mecho (IOI09_mecho) C++11
38 / 100
 240 ms 6528 KB 
#include <bits/stdc++.h>
using namespace std;

using pii = pair<int, int>;
#define X first
#define Y second

const int N = 805, INF = int(1e9), dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1};

int n, s, d[N][N], e[N][N], sx, sy, ex, ey;
queue<pii> q;
char b[N][N];

int f(int x){
    q.push({sx, sy});
    for(int i = 1; i <= n; i++) fill(e[i] + 1, e[i] + n + 1, INF);
    e[sx][sy] = 0;
    while(!q.empty()){
        pii c = q.front();
        q.pop();
        for(int i = 0; i < 4; i++){
            pii nx = {c.X + dx[i], c.Y + dy[i]};
            if(nx.X < 1 || nx.X > n || nx.Y < 1 || nx.Y > n) continue;
            if(b[nx.X][nx.Y] != 'G' && b[nx.X][nx.Y] != 'D') continue;
            if(e[nx.X][nx.Y] <= e[c.X][c.Y] + 1) continue;
            if(e[c.X][c.Y] / s >= d[nx.X][nx.Y] - x) continue;
            e[nx.X][nx.Y] = e[c.X][c.Y] + 1;
            q.push(nx);
        }
    }
    //puts("");
    //for(int i=1;i<=n;i++,puts(""))for(int j=1;j<=n;j++)printf("%d ",e[i][j]%INF);
    return (e[ex][ey] != INF);
}

int main(){
    scanf("%d%d", &n, &s);
    for(int i = 1; i <= n; i++) scanf("%s", b[i] + 1);
    for(int i = 1; i <= n; i++) fill(d[i] + 1, d[i] + n + 1, INF);
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            if(b[i][j] == 'H'){ q.push({i, j}); d[i][j] = 0; }
            else if(b[i][j] == 'M'){ sx = i; sy = j; }
            else if(b[i][j] == 'D'){ ex = i; ey = j; }
        }
    }
    while(!q.empty()){
        pii c = q.front();
        q.pop();
        for(int i = 0; i < 4; i++){
            pii nx = {c.X + dx[i], c.Y + dy[i]};
            if(nx.X < 1 || nx.X > n || nx.Y < 1 || nx.Y > n) continue;
            if(b[nx.X][nx.Y] != 'G' && b[nx.X][nx.Y] != 'M') continue;
            if(d[nx.X][nx.Y] <= d[c.X][c.Y] + 1) continue;
            d[nx.X][nx.Y] = d[c.X][c.Y] + 1;
            q.push(nx);
        }
    }
    int l = 0, r = n * n;
    while(l <= r){
        int m = (l + r) / 2;
        if(f(m)) l = m + 1;
        else r = m - 1;
    }
    printf("%d\n", r);
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:37:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &s);
     ~~~~~^~~~~~~~~~~~~~~~
mecho.cpp:38:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1; i <= n; i++) scanf("%s", b[i] + 1);
                                 ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
38.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 376 KB Output isn't correct
2 Incorrect 3 ms 556 KB Output isn't correct
3 Incorrect 2 ms 556 KB Output isn't correct
4 Incorrect 2 ms 556 KB Output isn't correct
5 Correct 3 ms 556 KB Output is correct
6 Correct 2 ms 556 KB Output is correct
7 Correct 104 ms 6244 KB Output is correct
8 Incorrect 2 ms 6244 KB Output isn't correct
9 Correct 2 ms 6244 KB Output is correct
10 Correct 2 ms 6244 KB Output is correct
11 Correct 2 ms 6244 KB Output is correct
12 Incorrect 2 ms 6244 KB Output isn't correct
13 Incorrect 3 ms 6244 KB Output isn't correct
14 Correct 3 ms 6244 KB Output is correct
15 Incorrect 2 ms 6244 KB Output isn't correct
16 Correct 2 ms 6244 KB Output is correct
17 Incorrect 2 ms 6244 KB Output isn't correct
18 Correct 2 ms 6244 KB Output is correct
19 Incorrect 2 ms 6244 KB Output isn't correct
20 Correct 2 ms 6244 KB Output is correct
21 Incorrect 2 ms 6244 KB Output isn't correct
22 Correct 2 ms 6244 KB Output is correct
23 Incorrect 3 ms 6244 KB Output isn't correct
24 Correct 3 ms 6244 KB Output is correct
25 Incorrect 3 ms 6244 KB Output isn't correct
26 Correct 3 ms 6244 KB Output is correct
27 Incorrect 3 ms 6244 KB Output isn't correct
28 Correct 3 ms 6244 KB Output is correct
29 Incorrect 2 ms 6244 KB Output isn't correct
30 Correct 2 ms 6244 KB Output is correct
31 Incorrect 2 ms 6244 KB Output isn't correct
32 Correct 3 ms 6244 KB Output is correct
33 Incorrect 9 ms 6244 KB Output isn't correct
34 Correct 8 ms 6244 KB Output is correct
35 Correct 25 ms 6244 KB Output is correct
36 Incorrect 10 ms 6244 KB Output isn't correct
37 Correct 10 ms 6244 KB Output is correct
38 Correct 30 ms 6244 KB Output is correct
39 Incorrect 11 ms 6244 KB Output isn't correct
40 Correct 12 ms 6244 KB Output is correct
41 Correct 44 ms 6244 KB Output is correct
42 Incorrect 13 ms 6244 KB Output isn't correct
43 Correct 14 ms 6244 KB Output is correct
44 Correct 70 ms 6244 KB Output is correct
45 Incorrect 21 ms 6244 KB Output isn't correct
46 Correct 15 ms 6244 KB Output is correct
47 Correct 66 ms 6244 KB Output is correct
48 Incorrect 16 ms 6244 KB Output isn't correct
49 Correct 23 ms 6244 KB Output is correct
50 Correct 81 ms 6244 KB Output is correct
51 Incorrect 19 ms 6244 KB Output isn't correct
52 Correct 21 ms 6244 KB Output is correct
53 Correct 113 ms 6244 KB Output is correct
54 Incorrect 21 ms 6244 KB Output isn't correct
55 Correct 38 ms 6244 KB Output is correct
56 Correct 179 ms 6244 KB Output is correct
57 Incorrect 29 ms 6244 KB Output isn't correct
58 Correct 33 ms 6244 KB Output is correct
59 Correct 150 ms 6244 KB Output is correct
60 Incorrect 29 ms 6260 KB Output isn't correct
61 Correct 30 ms 6396 KB Output is correct
62 Correct 177 ms 6396 KB Output is correct
63 Correct 126 ms 6396 KB Output is correct
64 Correct 240 ms 6396 KB Output is correct
65 Correct 191 ms 6396 KB Output is correct
66 Incorrect 179 ms 6396 KB Output isn't correct
67 Correct 162 ms 6396 KB Output is correct
68 Correct 85 ms 6396 KB Output is correct
69 Correct 69 ms 6396 KB Output is correct
70 Correct 46 ms 6396 KB Output is correct
71 Correct 52 ms 6396 KB Output is correct
72 Incorrect 46 ms 6396 KB Output isn't correct
73 Incorrect 82 ms 6508 KB Output isn't correct
74 Correct 96 ms 6524 KB Output is correct
75 Correct 84 ms 6524 KB Output is correct
76 Correct 72 ms 6524 KB Output is correct
77 Correct 80 ms 6524 KB Output is correct
78 Correct 112 ms 6524 KB Output is correct
79 Correct 60 ms 6528 KB Output is correct
80 Correct 74 ms 6528 KB Output is correct
81 Correct 83 ms 6528 KB Output is correct
82 Correct 70 ms 6528 KB Output is correct
83 Correct 99 ms 6528 KB Output is correct
84 Correct 86 ms 6528 KB Output is correct
85 Correct 129 ms 6528 KB Output is correct
86 Correct 95 ms 6528 KB Output is correct
87 Correct 104 ms 6528 KB Output is correct
88 Correct 115 ms 6528 KB Output is correct
89 Correct 104 ms 6528 KB Output is correct
90 Correct 119 ms 6528 KB Output is correct
91 Correct 103 ms 6528 KB Output is correct
92 Correct 114 ms 6528 KB Output is correct