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Submission #468617

# Submission time Handle Problem Language Result Execution time Memory
468617 2021-08-29T03:35:31 Z Yuisuyuno Mecho (IOI09_mecho) C++14
100 / 100
 197 ms 11624 KB 
//Nguyen Huu Hoang Minh
#include <bits/stdc++.h>
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define reset(x) memset(x, 0,sizeof(x))
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define N 805
#define remain(x) if (x > MOD) x -= MOD
#define ii pair<int, int>
#define iiii pair< ii , ii >
#define viiii vector< iiii >
#define vi vector<int>
#define vii vector< ii >
#define bit(x, i) (((x) >> (i)) & 1)
#define Task "test"
#define int long long

using namespace std;

typedef long double ld;
const int inf = 1e10;
const int minf = -1e10;

int n, s;
char a[N][N];
ii M, D;
vector<ii> bee;

void readfile()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    if (fopen(Task".inp","r"))
    {
        freopen(Task".inp","r",stdin);
        //freopen(Task".out","w",stdout);
    }
    cin >> n >> s;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            cin >> a[i][j];
            if (a[i][j]=='M') M = ii(i,j);
            if (a[i][j]=='D') D = ii(i,j);
            if (a[i][j]=='H') bee.pb(ii(i,j));
        }
    }
}

int d[N][N];
int dm[N][N];
int dx[4] = {1,-1,0,0};
int dy[4] = {0,0,1,-1};
bool ok(int x, int y){
    if (1 <= x && x <= n && 1 <= y && y <= n) return true;
    return false;
}

void build_bee(){
    queue<ii> q;
    memset(d, -1, sizeof d);
    for(ii x : bee){
        d[x.fi][x.se]=0;
        q.push(ii(x.fi,x.se));
    }
    while (q.size()){
        int u = q.front().fi;
        int v = q.front().se;
        //cout << u << ' ' << v << ' ' << d[u][v] << endl;
        q.pop();
        for(int i=0; i<4; i++){
            int x = u + dx[i];
            int y = v + dy[i];
            if (d[x][y]==-1 && ok(x,y) && (a[x][y]=='G'||a[x][y]=='M')){
                d[x][y] = d[u][v] + s;
                q.push(ii(x,y));
            }
        }
    }
    d[D.fi][D.se] = 1e18;
}

bool can_eat(int ti){
    if (ti*s >= d[M.fi][M.se]) return false;
    queue<ii> q;
    memset(dm, -1, sizeof dm);
    dm[M.fi][M.se] = ti*s;
    q.push(ii(M.fi,M.se));
    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];
            int y = v + dy[i];
            if (!ok(x,y) || a[x][y]=='T' || a[x][y]=='H') continue;
            if (dm[x][y]==-1){
                dm[x][y] = dm[u][v] + 1;
                if (dm[x][y] < d[x][y]){
                    q.push(ii(x,y));
                }
            }
        }
    }
    return (dm[D.fi][D.se]!=-1);
}

void proc()
{
    build_bee();
    int l = 0, r = 1e9, ans=-1;
    while (r-l > 0){
        int mid = (l+r)/2;
        if (can_eat(mid)){
            l = mid+1;
            ans = mid;
        }
        else r = mid;
    }
    cout << ans;
}

signed main()
{
    readfile();
    proc();
    return 0;
}

Compilation message

mecho.cpp: In function 'void readfile()':
mecho.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(Task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10444 KB Output is correct
2 Correct 6 ms 10464 KB Output is correct
3 Correct 6 ms 10464 KB Output is correct
4 Correct 6 ms 10444 KB Output is correct
5 Correct 6 ms 10444 KB Output is correct
6 Correct 7 ms 10444 KB Output is correct
7 Correct 119 ms 11248 KB Output is correct
8 Correct 6 ms 10444 KB Output is correct
9 Correct 6 ms 10444 KB Output is correct
10 Correct 7 ms 10444 KB Output is correct
11 Correct 6 ms 10444 KB Output is correct
12 Correct 7 ms 10444 KB Output is correct
13 Correct 6 ms 10444 KB Output is correct
14 Correct 8 ms 10444 KB Output is correct
15 Correct 7 ms 10364 KB Output is correct
16 Correct 7 ms 10480 KB Output is correct
17 Correct 6 ms 10444 KB Output is correct
18 Correct 6 ms 10444 KB Output is correct
19 Correct 7 ms 10444 KB Output is correct
20 Correct 7 ms 10444 KB Output is correct
21 Correct 7 ms 10444 KB Output is correct
22 Correct 6 ms 10444 KB Output is correct
23 Correct 7 ms 10440 KB Output is correct
24 Correct 6 ms 10444 KB Output is correct
25 Correct 7 ms 10516 KB Output is correct
26 Correct 7 ms 10480 KB Output is correct
27 Correct 7 ms 10444 KB Output is correct
28 Correct 7 ms 10444 KB Output is correct
29 Correct 8 ms 10444 KB Output is correct
30 Correct 8 ms 10444 KB Output is correct
31 Correct 8 ms 10444 KB Output is correct
32 Correct 7 ms 10532 KB Output is correct
33 Correct 13 ms 10700 KB Output is correct
34 Correct 13 ms 10744 KB Output is correct
35 Correct 33 ms 10748 KB Output is correct
36 Correct 13 ms 10700 KB Output is correct
37 Correct 13 ms 10708 KB Output is correct
38 Correct 42 ms 10712 KB Output is correct
39 Correct 14 ms 10700 KB Output is correct
40 Correct 14 ms 10800 KB Output is correct
41 Correct 50 ms 10824 KB Output is correct
42 Correct 14 ms 10840 KB Output is correct
43 Correct 13 ms 10848 KB Output is correct
44 Correct 66 ms 10828 KB Output is correct
45 Correct 18 ms 10828 KB Output is correct
46 Correct 18 ms 10820 KB Output is correct
47 Correct 78 ms 10828 KB Output is correct
48 Correct 20 ms 10828 KB Output is correct
49 Correct 21 ms 10936 KB Output is correct
50 Correct 94 ms 10932 KB Output is correct
51 Correct 22 ms 10976 KB Output is correct
52 Correct 24 ms 10908 KB Output is correct
53 Correct 111 ms 10920 KB Output is correct
54 Correct 26 ms 10956 KB Output is correct
55 Correct 28 ms 10936 KB Output is correct
56 Correct 138 ms 11012 KB Output is correct
57 Correct 25 ms 10944 KB Output is correct
58 Correct 23 ms 10956 KB Output is correct
59 Correct 157 ms 11060 KB Output is correct
60 Correct 27 ms 11096 KB Output is correct
61 Correct 28 ms 10980 KB Output is correct
62 Correct 175 ms 11084 KB Output is correct
63 Correct 130 ms 11084 KB Output is correct
64 Correct 197 ms 11044 KB Output is correct
65 Correct 192 ms 11076 KB Output is correct
66 Correct 143 ms 11092 KB Output is correct
67 Correct 145 ms 11084 KB Output is correct
68 Correct 64 ms 11132 KB Output is correct
69 Correct 59 ms 11148 KB Output is correct
70 Correct 53 ms 11088 KB Output is correct
71 Correct 47 ms 11080 KB Output is correct
72 Correct 43 ms 11116 KB Output is correct
73 Correct 43 ms 11624 KB Output is correct
74 Correct 84 ms 11556 KB Output is correct
75 Correct 91 ms 11600 KB Output is correct
76 Correct 79 ms 11600 KB Output is correct
77 Correct 84 ms 11588 KB Output is correct
78 Correct 101 ms 11528 KB Output is correct
79 Correct 71 ms 11552 KB Output is correct
80 Correct 76 ms 11548 KB Output is correct
81 Correct 84 ms 11592 KB Output is correct
82 Correct 71 ms 11512 KB Output is correct
83 Correct 101 ms 11536 KB Output is correct
84 Correct 97 ms 11460 KB Output is correct
85 Correct 88 ms 11456 KB Output is correct
86 Correct 99 ms 11516 KB Output is correct
87 Correct 95 ms 11464 KB Output is correct
88 Correct 104 ms 11420 KB Output is correct
89 Correct 116 ms 11424 KB Output is correct
90 Correct 109 ms 11332 KB Output is correct
91 Correct 105 ms 11364 KB Output is correct
92 Correct 107 ms 11388 KB Output is correct