oj.uz

Submission #1084600

# Submission time Handle Problem Language Result Execution time Memory
1084600 2024-09-06T13:10:25 Z kiethm07 Mecho (IOI09_mecho) C++11
84 / 100
 813 ms 12352 KB 
#include <bits/stdc++.h>

#define pii pair<int,int>
#define iii pair<int,pii>
#define fi first
#define se second

#define vi vector<int>
#define vii vector<pii>
#define pb(i) push_back(i)
#define all(x) x.begin(),x.end()

#define TEXT "a"

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

const int inf = 1e9 + 7;
const ld eps = 1e-8;
const double pi = acos(-1);
const int N = 805;

int n,s;
int f[N][N], g[N][N];
char a[N][N];
int dx[4] = {0,0,1,-1};
int dy[4] = {1,-1,0,0};

bool check(int val){
    queue<pii> q;
    memset(f,-1,sizeof(f));
    memset(g,-1,sizeof(g));
    pii M, D;
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
            if (a[i][j] == 'M') M = pii(i,j);
            if (a[i][j] == 'D') D = pii(i,j);
            if (a[i][j] == 'H'){
                q.push(pii(i,j));
                f[i][j] = 0;
            }
        }
    }
    while(!q.empty()){
        pii u = q.front();
        q.pop();
        if (f[u.fi][u.se] >= val) continue;
        for (int i = 0; i < 4; i++){
            int x = u.fi + dx[i];
            int y = u.se + dy[i];
            if (x == 0 || x > n || y == 0 || y > n) continue;
            if (a[x][y] == 'T' || a[x][y] == 'D') continue;
            if (f[x][y] != -1) continue;
            f[x][y] = f[u.fi][u.se] + 1;
            q.push(pii(x,y));
        }
    }
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
            if (f[i][j] == -1) continue;
            f[i][j] = 0;
            q.push(pii(i,j));
        }
    }
    while(!q.empty()){
        pii u = q.front();
        q.pop();
        for (int i = 0; i < 4; i++){
            int x = u.fi + dx[i];
            int y = u.se + dy[i];
            if (x == 0 || x > n || y == 0 || y > n) continue;
            if (a[x][y] == 'T' || a[x][y] == 'D') continue;
            if (f[x][y] != -1) continue;
            f[x][y] = f[u.fi][u.se] + s;
            q.push(pii(x,y));
        }
    }
    f[D.fi][D.se] = inf;
    g[M.fi][M.se] = 0;
    q.push(M);
    while(!q.empty()){
        pii u = q.front();
        q.pop();
        for (int i = 0; i < 4; i++){
            int x = u.fi + dx[i];
            int y = u.se + dy[i];
            if (x == 0 || x > n || y == 0 || y > n) continue;
            if (a[x][y] == 'T') continue;
            if (g[x][y] != -1) continue;
            if (f[x][y] <= g[u.fi][u.se] + 1) continue;
            g[x][y] = g[u.fi][u.se] + 1;
            q.push(pii(x,y));
        }
    }
    return g[D.fi][D.se] != -1;
}

int main(){
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen(TEXT".inp","r")){
        freopen(TEXT".inp","r",stdin);
        freopen(TEXT".out","w",stdout);
    }
    cin >> n >> s;
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++) cin >> a[i][j];
    }
    int res = -1;
    int l = 0;
    int r = inf;
//    cout << check(2) << "\n";
//    for (int i = 1; i <= n; i++){
//        for (int j = 1; j <= n; j++){
//            cout << f[i][j] << " ";
//        }
//        cout << "\n";
//    }
    while(l <= r){
        int mid = (l + r) / 2;
        if (check(mid)){
            res = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    cout << res << "\n";
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen(TEXT".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen(TEXT".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5468 KB Output is correct
2 Correct 6 ms 5468 KB Output is correct
3 Correct 5 ms 5540 KB Output is correct
4 Correct 5 ms 5536 KB Output is correct
5 Correct 5 ms 5468 KB Output is correct
6 Correct 5 ms 5468 KB Output is correct
7 Correct 659 ms 12036 KB Output is correct
8 Correct 6 ms 5464 KB Output is correct
9 Correct 5 ms 5468 KB Output is correct
10 Correct 6 ms 5468 KB Output is correct
11 Correct 6 ms 5468 KB Output is correct
12 Incorrect 7 ms 5576 KB Output isn't correct
13 Incorrect 9 ms 5468 KB Output isn't correct
14 Correct 11 ms 5468 KB Output is correct
15 Correct 6 ms 5468 KB Output is correct
16 Correct 6 ms 5464 KB Output is correct
17 Correct 6 ms 5468 KB Output is correct
18 Correct 6 ms 5468 KB Output is correct
19 Correct 6 ms 5720 KB Output is correct
20 Correct 6 ms 5564 KB Output is correct
21 Correct 6 ms 5468 KB Output is correct
22 Correct 7 ms 5468 KB Output is correct
23 Correct 6 ms 5592 KB Output is correct
24 Correct 7 ms 5468 KB Output is correct
25 Correct 7 ms 5468 KB Output is correct
26 Correct 7 ms 5468 KB Output is correct
27 Correct 8 ms 5724 KB Output is correct
28 Correct 9 ms 5468 KB Output is correct
29 Correct 8 ms 5420 KB Output is correct
30 Correct 8 ms 5468 KB Output is correct
31 Correct 8 ms 5632 KB Output is correct
32 Correct 9 ms 5468 KB Output is correct
33 Correct 75 ms 6448 KB Output is correct
34 Correct 66 ms 6440 KB Output is correct
35 Correct 95 ms 6660 KB Output is correct
36 Correct 88 ms 6644 KB Output is correct
37 Correct 97 ms 6640 KB Output is correct
38 Correct 121 ms 6964 KB Output is correct
39 Correct 107 ms 6904 KB Output is correct
40 Correct 103 ms 6896 KB Output is correct
41 Correct 161 ms 7272 KB Output is correct
42 Correct 134 ms 7168 KB Output is correct
43 Correct 130 ms 7320 KB Output is correct
44 Correct 184 ms 7676 KB Output is correct
45 Correct 169 ms 7516 KB Output is correct
46 Correct 149 ms 7476 KB Output is correct
47 Correct 227 ms 8116 KB Output is correct
48 Correct 191 ms 7848 KB Output is correct
49 Correct 180 ms 7776 KB Output is correct
50 Correct 267 ms 8560 KB Output is correct
51 Correct 227 ms 8176 KB Output is correct
52 Correct 212 ms 8188 KB Output is correct
53 Correct 317 ms 9048 KB Output is correct
54 Correct 249 ms 8536 KB Output is correct
55 Correct 249 ms 8592 KB Output is correct
56 Correct 376 ms 9560 KB Output is correct
57 Correct 288 ms 8980 KB Output is correct
58 Correct 274 ms 8968 KB Output is correct
59 Correct 414 ms 10116 KB Output is correct
60 Correct 351 ms 9408 KB Output is correct
61 Correct 314 ms 9440 KB Output is correct
62 Correct 461 ms 10708 KB Output is correct
63 Correct 669 ms 9892 KB Output is correct
64 Correct 701 ms 9912 KB Output is correct
65 Correct 699 ms 10152 KB Output is correct
66 Correct 679 ms 9908 KB Output is correct
67 Correct 645 ms 9912 KB Output is correct
68 Correct 726 ms 9980 KB Output is correct
69 Correct 726 ms 9916 KB Output is correct
70 Correct 695 ms 9900 KB Output is correct
71 Correct 713 ms 9904 KB Output is correct
72 Incorrect 813 ms 9912 KB Output isn't correct
73 Incorrect 645 ms 11888 KB Output isn't correct
74 Correct 704 ms 11984 KB Output is correct
75 Correct 716 ms 11956 KB Output is correct
76 Correct 710 ms 11972 KB Output is correct
77 Correct 723 ms 11972 KB Output is correct
78 Correct 626 ms 11976 KB Output is correct
79 Correct 669 ms 12352 KB Output is correct
80 Correct 676 ms 11976 KB Output is correct
81 Correct 661 ms 11952 KB Output is correct
82 Correct 659 ms 11956 KB Output is correct
83 Correct 645 ms 12068 KB Output is correct
84 Correct 724 ms 11964 KB Output is correct
85 Correct 669 ms 12120 KB Output is correct
86 Correct 678 ms 11960 KB Output is correct
87 Correct 700 ms 11952 KB Output is correct
88 Correct 654 ms 11988 KB Output is correct
89 Correct 655 ms 11980 KB Output is correct
90 Correct 651 ms 11984 KB Output is correct
91 Correct 667 ms 11972 KB Output is correct
92 Correct 643 ms 11992 KB Output is correct