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Submission #465145

# Submission time Handle Problem Language Result Execution time Memory
465145 2021-08-15T08:58:08 Z MohamedFaresNebili Mecho (IOI09_mecho) C++14
4 / 100
 58 ms 34508 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
using ll  = long long;
using ld  = long double;
using db  = double;
using ii  = pair<int, int>;
using pl  = pair<ll, ll>;
using vi  = vector<int>;
using vl  = vector<ll>;
using vii = vector<ii>;
using vpl = vector<pl>;
 
#define mp make_pair
#define pb push_back
#define pp pop_back
#define ff first
#define ss second
#define lb lower_bound
#define ub upper_bound
#define sz(v) ((int)v.size())
#define all(x) (x).begin() , (x).end()
#define FAST ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
 
ld dist(ld x, ld y, ld a, ld b) { return sqrt((x-a)*(x-a) + (y-b)*(y-b)); }
ll gcd(ll a , ll b){ return b ? gcd(b , a % b) : a ;}
ll lcm(ll a , ll b){ return (a * b) / gcd(a , b);}
ll fact(ll n) { return n > 1?(n * fact(n-1)):1;}
void setIn(string s) { freopen(s.c_str(),"r",stdin); }
void setOut(string s) { freopen(s.c_str(),"w",stdout); }
void IO(string s = "") { if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } }
 
const int N = 2024;
const int inf = 1e9;
const int MOD = 1e9+7;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up
const int dr[8] = {1,1,0,-1,-1,-1, 0, 1}, dc[8] = {0,1,1, 1, 0,-1,-1,-1};  // S,SE,E,NE,N,NW,W,SW
const long long INF = 1e18;
const double EPS = 1e-9;
const double PI = 3.14159265358979323846;
 
/** |||||||||||||||||||||||||||||||| SOLUTION |||||||||||||||||||||||||||||||| **/
 
ll n, m; char grid[N][N]; ll d[N][N];
ll vis[N][N]; ll sx, sy, hx, hy;
bool bfs(ll v)
{
    if(v*m>=d[sx][sy]) return false;
    memset(vis, 0, sizeof(vis)); vis[sx][sy]=1;
    deque<pair<ll, pl>>q; q.pb(mp(v*m, mp(sx, sy)));
    while(!q.empty()) {
        ll w=q.front().ff, a=q.front().ss.ff, b=q.front().ss.ss; q.pop_front();
        if(grid[a][b]=='D') return true;
        for(ll l=0;l<4;l++) {
            ll x=a+nx[l], y=b+ny[l];
            if(x>=0&&x<n&&y>=0&&y<n) {
                if(grid[x][y]=='T'||w+1>=d[x][y]||vis[x][y]) continue;
                q.pb(mp(w+1, mp(x, y))); vis[x][y]=1;
            }
        }
    }
    return false;
}
 
void solve()
{
    /// JUST KEEP GOING
    cin>>n>>m; deque<pl>q; memset(d, -1, sizeof d);
    for(ll l=0;l<n;l++) {
        for(ll i=0;i<n;i++) {
            cin>>grid[l][i]; 
            if(grid[l][i]=='H') { d[l][i]=0; q.pb(mp(l, i)); }
            else if(grid[l][i]=='M') { sx=l; sy=i; grid[l][i]=='G'; }
            else if(grid[l][i]=='D') { hx=l; hy=i; }
        }
    }
    while(!q.empty()) {
        ll a=q.front().ff, b=q.front().ss; q.pop_front();
        for(ll l=0;l<4;l++) {
            ll x=a+nx[l], y=b+ny[l];
            if(x>=0&&x<n&&y>=0&&y<n) {
                if(d[x][y]==-1&&grid[x][y]=='G') {
                    d[x][y]=d[a][b]+m; q.push_back(mp(x, y));
                }
            }
        }
    }
    ll lo=-1, hi=1e9; d[hx][hy]=1e9;
    while(hi-lo>1) {
        ll mid=(lo+hi)/2;
        if(bfs(mid)) { lo=mid; }
        else hi=mid;
    }
    cout<<lo<<'\n';
}
 
int32_t main()
{
 
    FAST; /// IO("lasers");
    int t; t=1;
    while(t--) {
        solve();
    }
    return 0;
 
}
 
/*** Stuff you should look for :
   * int overflow, array bounds.
   * special cases (n=1?).
   * Observe The Constraints.
   * do smth instead of nothing and stay organized.
   * Reformulate The Problem Into Something More Theoretical.
   * WRITE STUFF DOWN.
   * DON'T GET STUCK ON ONE APPROACH.
   * Don't Spend Too Much Time On The Problem: Move On!
   * If You Don't Fight You Cannot Win.
***/

Compilation message

mecho.cpp: In function 'void solve()':
mecho.cpp:74:62: warning: statement has no effect [-Wunused-value]
   74 |             else if(grid[l][i]=='M') { sx=l; sy=i; grid[l][i]=='G'; }
      |                                                    ~~~~~~~~~~^~~~~
mecho.cpp: In function 'void setIn(std::string)':
mecho.cpp:30:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 | void setIn(string s) { freopen(s.c_str(),"r",stdin); }
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
mecho.cpp: In function 'void setOut(std::string)':
mecho.cpp:31:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 | void setOut(string s) { freopen(s.c_str(),"w",stdout); }
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 17 ms 32408 KB Output isn't correct
2 Incorrect 17 ms 32368 KB Output isn't correct
3 Incorrect 17 ms 32332 KB Output isn't correct
4 Incorrect 16 ms 32324 KB Output isn't correct
5 Incorrect 17 ms 32312 KB Output isn't correct
6 Incorrect 16 ms 32392 KB Output isn't correct
7 Incorrect 46 ms 34116 KB Output isn't correct
8 Correct 16 ms 32332 KB Output is correct
9 Incorrect 17 ms 32332 KB Output isn't correct
10 Incorrect 17 ms 32392 KB Output isn't correct
11 Incorrect 16 ms 32348 KB Output isn't correct
12 Incorrect 18 ms 32512 KB Output isn't correct
13 Incorrect 17 ms 32476 KB Output isn't correct
14 Correct 17 ms 32416 KB Output is correct
15 Incorrect 16 ms 32412 KB Output isn't correct
16 Incorrect 17 ms 32332 KB Output isn't correct
17 Incorrect 17 ms 32380 KB Output isn't correct
18 Incorrect 17 ms 32388 KB Output isn't correct
19 Incorrect 17 ms 32452 KB Output isn't correct
20 Incorrect 17 ms 32424 KB Output isn't correct
21 Incorrect 17 ms 32460 KB Output isn't correct
22 Incorrect 16 ms 32396 KB Output isn't correct
23 Incorrect 17 ms 32460 KB Output isn't correct
24 Incorrect 17 ms 32420 KB Output isn't correct
25 Incorrect 18 ms 32448 KB Output isn't correct
26 Incorrect 16 ms 32404 KB Output isn't correct
27 Incorrect 17 ms 32532 KB Output isn't correct
28 Incorrect 17 ms 32476 KB Output isn't correct
29 Incorrect 17 ms 32476 KB Output isn't correct
30 Incorrect 17 ms 32432 KB Output isn't correct
31 Incorrect 18 ms 32444 KB Output isn't correct
32 Incorrect 17 ms 32460 KB Output isn't correct
33 Incorrect 20 ms 33076 KB Output isn't correct
34 Incorrect 21 ms 32964 KB Output isn't correct
35 Incorrect 22 ms 32992 KB Output isn't correct
36 Incorrect 23 ms 33108 KB Output isn't correct
37 Incorrect 20 ms 33100 KB Output isn't correct
38 Incorrect 27 ms 33196 KB Output isn't correct
39 Incorrect 23 ms 33184 KB Output isn't correct
40 Incorrect 22 ms 33220 KB Output isn't correct
41 Incorrect 26 ms 33284 KB Output isn't correct
42 Incorrect 23 ms 33356 KB Output isn't correct
43 Incorrect 24 ms 33292 KB Output isn't correct
44 Incorrect 29 ms 33356 KB Output isn't correct
45 Incorrect 26 ms 33388 KB Output isn't correct
46 Incorrect 24 ms 33404 KB Output isn't correct
47 Incorrect 30 ms 33456 KB Output isn't correct
48 Incorrect 28 ms 33464 KB Output isn't correct
49 Incorrect 26 ms 33532 KB Output isn't correct
50 Incorrect 32 ms 33584 KB Output isn't correct
51 Incorrect 27 ms 33604 KB Output isn't correct
52 Incorrect 29 ms 33640 KB Output isn't correct
53 Incorrect 35 ms 33680 KB Output isn't correct
54 Incorrect 30 ms 33740 KB Output isn't correct
55 Incorrect 32 ms 33688 KB Output isn't correct
56 Incorrect 40 ms 33732 KB Output isn't correct
57 Incorrect 32 ms 33804 KB Output isn't correct
58 Incorrect 32 ms 33812 KB Output isn't correct
59 Incorrect 45 ms 33888 KB Output isn't correct
60 Incorrect 34 ms 33924 KB Output isn't correct
61 Incorrect 33 ms 33868 KB Output isn't correct
62 Incorrect 50 ms 33984 KB Output isn't correct
63 Incorrect 44 ms 33868 KB Output isn't correct
64 Incorrect 44 ms 33904 KB Output isn't correct
65 Incorrect 44 ms 34068 KB Output isn't correct
66 Incorrect 47 ms 33868 KB Output isn't correct
67 Correct 45 ms 33936 KB Output is correct
68 Incorrect 48 ms 33920 KB Output isn't correct
69 Incorrect 49 ms 33996 KB Output isn't correct
70 Incorrect 53 ms 33996 KB Output isn't correct
71 Incorrect 49 ms 33960 KB Output isn't correct
72 Incorrect 49 ms 34024 KB Output isn't correct
73 Incorrect 56 ms 34488 KB Output isn't correct
74 Incorrect 57 ms 34456 KB Output isn't correct
75 Incorrect 54 ms 34500 KB Output isn't correct
76 Incorrect 55 ms 34444 KB Output isn't correct
77 Incorrect 58 ms 34508 KB Output isn't correct
78 Correct 47 ms 34464 KB Output is correct
79 Incorrect 51 ms 34456 KB Output isn't correct
80 Incorrect 47 ms 34396 KB Output isn't correct
81 Incorrect 48 ms 34380 KB Output isn't correct
82 Incorrect 50 ms 34460 KB Output isn't correct
83 Incorrect 47 ms 34388 KB Output isn't correct
84 Incorrect 51 ms 34276 KB Output isn't correct
85 Incorrect 50 ms 34388 KB Output isn't correct
86 Incorrect 53 ms 34320 KB Output isn't correct
87 Incorrect 54 ms 34356 KB Output isn't correct
88 Incorrect 49 ms 34284 KB Output isn't correct
89 Incorrect 48 ms 34252 KB Output isn't correct
90 Incorrect 46 ms 34252 KB Output isn't correct
91 Incorrect 47 ms 34284 KB Output isn't correct
92 Incorrect 47 ms 34296 KB Output isn't correct