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Submission #465141

# Submission time Handle Problem Language Result Execution time Memory
465141 2021-08-15T08:48:00 Z MohamedFaresNebili Mecho (IOI09_mecho) C++14
84 / 100
 249 ms 12692 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 = 824;
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;
    for(ll l=0;l<n;l++) {
        for(ll i=0;i<n;i++) {
            cin>>grid[l][i]; d[l][i]=inf;
            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]==inf&&grid[x][y]=='G') {
                    d[x][y]=d[a][b]+m; q.push_back(mp(x, y));
                }
            }
        }
    }
    ll lo=-1, hi=n*n*2; d[hx][hy]=n*n*m;
    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
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5580 KB Output is correct
2 Correct 5 ms 5580 KB Output is correct
3 Correct 4 ms 5580 KB Output is correct
4 Correct 5 ms 5580 KB Output is correct
5 Correct 5 ms 5580 KB Output is correct
6 Correct 5 ms 5572 KB Output is correct
7 Correct 145 ms 12280 KB Output is correct
8 Correct 5 ms 5708 KB Output is correct
9 Correct 5 ms 5708 KB Output is correct
10 Correct 5 ms 5708 KB Output is correct
11 Correct 5 ms 5692 KB Output is correct
12 Incorrect 7 ms 5952 KB Output isn't correct
13 Incorrect 6 ms 5912 KB Output isn't correct
14 Correct 6 ms 5952 KB Output is correct
15 Correct 5 ms 5708 KB Output is correct
16 Correct 5 ms 5708 KB Output is correct
17 Correct 5 ms 5708 KB Output is correct
18 Correct 6 ms 5708 KB Output is correct
19 Correct 7 ms 5788 KB Output is correct
20 Correct 6 ms 5796 KB Output is correct
21 Correct 6 ms 5836 KB Output is correct
22 Correct 6 ms 5836 KB Output is correct
23 Correct 6 ms 5828 KB Output is correct
24 Correct 6 ms 5908 KB Output is correct
25 Correct 6 ms 5964 KB Output is correct
26 Correct 6 ms 5964 KB Output is correct
27 Correct 6 ms 5964 KB Output is correct
28 Correct 6 ms 5964 KB Output is correct
29 Correct 7 ms 5968 KB Output is correct
30 Correct 7 ms 6012 KB Output is correct
31 Correct 8 ms 5964 KB Output is correct
32 Correct 7 ms 5964 KB Output is correct
33 Correct 11 ms 8216 KB Output is correct
34 Correct 12 ms 8300 KB Output is correct
35 Correct 48 ms 8300 KB Output is correct
36 Correct 13 ms 8652 KB Output is correct
37 Correct 13 ms 8700 KB Output is correct
38 Correct 51 ms 8708 KB Output is correct
39 Correct 14 ms 9044 KB Output is correct
40 Correct 14 ms 9008 KB Output is correct
41 Correct 64 ms 9036 KB Output is correct
42 Correct 16 ms 9420 KB Output is correct
43 Correct 16 ms 9464 KB Output is correct
44 Correct 82 ms 9600 KB Output is correct
45 Correct 19 ms 9868 KB Output is correct
46 Correct 21 ms 9936 KB Output is correct
47 Correct 92 ms 9940 KB Output is correct
48 Correct 19 ms 10240 KB Output is correct
49 Correct 20 ms 10292 KB Output is correct
50 Correct 112 ms 10348 KB Output is correct
51 Correct 27 ms 10692 KB Output is correct
52 Correct 22 ms 10700 KB Output is correct
53 Correct 150 ms 10780 KB Output is correct
54 Correct 23 ms 11068 KB Output is correct
55 Correct 24 ms 11136 KB Output is correct
56 Correct 175 ms 11200 KB Output is correct
57 Correct 27 ms 11576 KB Output is correct
58 Correct 25 ms 11596 KB Output is correct
59 Correct 181 ms 11736 KB Output is correct
60 Correct 29 ms 12056 KB Output is correct
61 Correct 27 ms 12012 KB Output is correct
62 Correct 210 ms 12008 KB Output is correct
63 Correct 139 ms 11976 KB Output is correct
64 Correct 249 ms 12060 KB Output is correct
65 Correct 210 ms 12136 KB Output is correct
66 Correct 163 ms 12012 KB Output is correct
67 Correct 145 ms 12060 KB Output is correct
68 Correct 63 ms 12028 KB Output is correct
69 Correct 73 ms 12068 KB Output is correct
70 Correct 48 ms 12108 KB Output is correct
71 Correct 57 ms 12036 KB Output is correct
72 Incorrect 51 ms 12076 KB Output isn't correct
73 Incorrect 114 ms 12692 KB Output isn't correct
74 Correct 91 ms 12508 KB Output is correct
75 Correct 113 ms 12560 KB Output is correct
76 Correct 97 ms 12612 KB Output is correct
77 Correct 101 ms 12588 KB Output is correct
78 Correct 132 ms 12568 KB Output is correct
79 Correct 74 ms 12552 KB Output is correct
80 Correct 94 ms 12500 KB Output is correct
81 Correct 109 ms 12556 KB Output is correct
82 Correct 93 ms 12484 KB Output is correct
83 Correct 134 ms 12476 KB Output is correct
84 Correct 110 ms 12436 KB Output is correct
85 Correct 143 ms 12484 KB Output is correct
86 Correct 129 ms 12480 KB Output is correct
87 Correct 119 ms 12424 KB Output is correct
88 Correct 130 ms 12316 KB Output is correct
89 Correct 135 ms 12380 KB Output is correct
90 Correct 142 ms 12380 KB Output is correct
91 Correct 134 ms 12356 KB Output is correct
92 Correct 145 ms 12384 KB Output is correct