Submission #762791

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
762791	2023-06-21T19:12:02 Z	bLIC	Mecho (IOI09_mecho)	C++17	22 / 100	170 ms	6444 KB

mecho

/**
 *  Author: Anil Byar
**/

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

// using namespace __gnu_pbds;
using namespace std;

// template<class T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;



#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define uniq(v) v.erase(unique(all(v)), v.end())
#define ft first
#define sd second
#define pb push_back
#define eb emplace_back

// Source: https://codeforces.com/blog/entry/68809
// { start
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// } end


typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<vl> vvl;

#define dbg if(0)

const ll MOD = 1e9+7;
const ll MOD9 = 998244353;
const ll INFLL = 1e18+5;
const int INF = 1e9;

void printbit(int x, int len) {string s="\n";while(len--){s=((x%2)?'1':'0')+s;x/=2;} cout<<s;}
ll power(ll x, ll y, ll mod){if (y==0) return 1;ll ret = power(x, y/2, mod);ret *= ret;ret%=mod;if (y&1) ret *= x;return ret%mod;}
ll modinv(ll x, ll mod = MOD) {return power(x, mod-2, mod);}

template<class T>
istream& operator>>(istream&in, vector<T>&v){
    for (T& x:v) in>>x;
    return in;
}
template<class T>
ostream& operator<<(ostream&out, vector<T>&v){
    for (T& x:v) out<<x<<' ';
    cout<<'\n';
    return out;
}
// use ?: with brackets (?:)
// check for overflow
// think about dp
// Read the statement carefully

const int maxN = 1;
const int maxK = 8001;

int dx[] = {1, 0, 0, -1};
int dy[] = {0, 1, -1, 0};

void solve(){
    int n, s;cin>>n>>s;
    vector<string> grid(n);
    for (int i = 0;i<n;i++) cin>>grid[i];

    vvi beetime(n, vi(n, INF));
    queue<pii> q;
    for (int i = 0;i<n;i++) for (int j = 0;j<n;j++) if (grid[i][j]=='H') {
        q.emplace(i, j);
        beetime[i][j] = 0;
    }
    while(!q.empty()){
        auto [x, y] = q.front();q.pop();
        int tim = beetime[x][y] + 1;
        for (int i = 0;i<4;i++){
            int xx = x+dx[i];
            int yy = y+dy[i];
            if (xx<0 || xx>=n || yy<0 || yy>=n || tim>=beetime[xx][yy] || grid[xx][yy]=='T' || grid[xx][yy]=='D'){
                continue;
            }
            beetime[xx][yy] = tim;
            q.emplace(xx, yy);
        }
    }

    auto check = [&](int m){
        vvi mtim(n, vi(n, INF));
        queue<array<int, 3>> qq;
        int fx, fy;
        for (int i = 0;i<n;i++){
            for (int j = 0;j<n;j++){
                if (grid[i][j]=='M'){
                    qq.push({i, j, 0});
                    mtim[i][j] = m;
                } else if (grid[i][j]=='D') fx=i, fy = j;
            }
        }
        vector<vector<bool>> poss(n, vector<bool>(n, false));

        while(!qq.empty()){
            auto [x, y, step] = qq.front();qq.pop();
            poss[x][y] = true;
            step++;
            int tim = mtim[x][y];
            if (step==1) tim++;
            if (step==s) {
                step = 0;
                if (beetime[x][y]==mtim[x][y]) continue;
            }
            for (int i = 0;i<4;i++){
                int xx = x+dx[i];
                int yy = y+dy[i];
                if (xx==fx && yy==fy) poss[fx][fy] = true;
                if (xx<0 || yy<0 || xx>=n || yy>=n || grid[xx][yy]=='T' || tim>=beetime[xx][yy] || tim>=mtim[xx][yy]){
                    continue;
                }
                mtim[xx][yy] = tim;
                if (step==s && tim==mtim[xx][yy]) continue;
                qq.push({xx, yy, step});
            }
        }
        if (poss[fx][fy]) return true;

        // mtim.assign(n, vi(n, INF));
        // mtim[fx][fy] = 0;

        // while(!q.empty()) q.pop();
        // q.emplace(fx, fy);
    
        // while(!q.empty()){
        //     auto [x, y] = q.front();q.pop();
        //     if (poss[x][y]) return true;

        //     int tim = mtim[x][y] + 1;
        //     for (int i = 0;i<4;i++){
        //         int xx = x+dx[i];
        //         int yy = y+dy[i];
        //         if (xx<0 || xx>=n || yy<0 || yy>=n || grid[xx][yy]=='T' || tim>=mtim[xx][yy]  || tim>s){
        //             continue;
        //         }
        //         mtim[xx][yy] = tim;
        //         q.emplace(xx, yy);
        //     }
        // }
        
        return false;
    };

    int l = -1, r = INF;
    while(r-l>1){
        int mid = (l+r)/2;
        if (check(mid)) l = mid;
        else r = mid;
    } 
    cout<<l;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);


#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
    freopen("input.in", "r", stdin);
    freopen("output.out", "w", stdout);
    freopen("debug.dbg", "w", stderr);
    int tt = clock();
#endif

    int t=1, i = 1;
    // cin>>t;
    while(t--){
        // cout<<"Case #"<<i++<<": ";
        solve();
        cout<<'\n';
    }
#ifndef ONLINE_JUDGE
    cerr << "TIME = " << (float)(clock() - tt)/CLOCKS_PER_SEC << endl;
    tt = clock();
#endif
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:212:14: warning: unused variable 'i' [-Wunused-variable]
  212 |     int t=1, i = 1;
      |              ^
mecho.cpp: In function 'void solve()':
mecho.cpp:162:20: warning: 'fx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  162 |         if (poss[fx][fy]) return true;
      |                    ^

Subtask #1

22.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	1 ms	212 KB	Output is correct
5	Incorrect	0 ms	212 KB	Output isn't correct
6	Incorrect	0 ms	212 KB	Output isn't correct
7	Incorrect	102 ms	6268 KB	Output isn't correct
8	Correct	1 ms	212 KB	Output is correct
9	Incorrect	1 ms	212 KB	Output isn't correct
10	Incorrect	1 ms	212 KB	Output isn't correct
11	Incorrect	1 ms	212 KB	Output isn't correct
12	Incorrect	1 ms	340 KB	Output isn't correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	1 ms	340 KB	Output is correct
15	Correct	1 ms	212 KB	Output is correct
16	Incorrect	0 ms	212 KB	Output isn't correct
17	Correct	0 ms	212 KB	Output is correct
18	Incorrect	0 ms	212 KB	Output isn't correct
19	Correct	0 ms	212 KB	Output is correct
20	Incorrect	1 ms	212 KB	Output isn't correct
21	Correct	1 ms	212 KB	Output is correct
22	Incorrect	1 ms	340 KB	Output isn't correct
23	Correct	1 ms	340 KB	Output is correct
24	Incorrect	1 ms	340 KB	Output isn't correct
25	Correct	1 ms	340 KB	Output is correct
26	Incorrect	1 ms	340 KB	Output isn't correct
27	Correct	1 ms	340 KB	Output is correct
28	Incorrect	1 ms	340 KB	Output isn't correct
29	Correct	1 ms	340 KB	Output is correct
30	Incorrect	1 ms	340 KB	Output isn't correct
31	Correct	1 ms	340 KB	Output is correct
32	Incorrect	1 ms	340 KB	Output isn't correct
33	Correct	8 ms	1480 KB	Output is correct
34	Incorrect	11 ms	1476 KB	Output isn't correct
35	Incorrect	23 ms	1476 KB	Output isn't correct
36	Correct	9 ms	1816 KB	Output is correct
37	Incorrect	10 ms	1884 KB	Output isn't correct
38	Incorrect	29 ms	1912 KB	Output isn't correct
39	Correct	12 ms	2232 KB	Output is correct
40	Incorrect	12 ms	2204 KB	Output isn't correct
41	Incorrect	37 ms	2212 KB	Output isn't correct
42	Correct	14 ms	2652 KB	Output is correct
43	Incorrect	14 ms	2696 KB	Output isn't correct
44	Incorrect	49 ms	2728 KB	Output isn't correct
45	Correct	17 ms	3164 KB	Output is correct
46	Incorrect	18 ms	3172 KB	Output isn't correct
47	Incorrect	63 ms	3192 KB	Output isn't correct
48	Correct	20 ms	3648 KB	Output is correct
49	Incorrect	21 ms	3636 KB	Output isn't correct
50	Incorrect	72 ms	3728 KB	Output isn't correct
51	Correct	23 ms	4256 KB	Output is correct
52	Incorrect	25 ms	4260 KB	Output isn't correct
53	Incorrect	82 ms	4228 KB	Output isn't correct
54	Correct	28 ms	4884 KB	Output is correct
55	Incorrect	31 ms	4844 KB	Output isn't correct
56	Incorrect	96 ms	4932 KB	Output isn't correct
57	Correct	30 ms	5512 KB	Output is correct
58	Incorrect	30 ms	5524 KB	Output isn't correct
59	Incorrect	123 ms	5560 KB	Output isn't correct
60	Correct	34 ms	6220 KB	Output is correct
61	Incorrect	36 ms	6240 KB	Output isn't correct
62	Incorrect	151 ms	6264 KB	Output isn't correct
63	Incorrect	103 ms	6260 KB	Output isn't correct
64	Incorrect	164 ms	6240 KB	Output isn't correct
65	Incorrect	170 ms	6224 KB	Output isn't correct
66	Correct	134 ms	6300 KB	Output is correct
67	Correct	119 ms	6220 KB	Output is correct
68	Incorrect	59 ms	6348 KB	Output isn't correct
69	Incorrect	81 ms	6228 KB	Output isn't correct
70	Incorrect	68 ms	6260 KB	Output isn't correct
71	Incorrect	50 ms	6280 KB	Output isn't correct
72	Correct	52 ms	6256 KB	Output is correct
73	Correct	75 ms	6284 KB	Output is correct
74	Incorrect	75 ms	6260 KB	Output isn't correct
75	Incorrect	79 ms	6284 KB	Output isn't correct
76	Incorrect	84 ms	6444 KB	Output isn't correct
77	Incorrect	76 ms	6360 KB	Output isn't correct
78	Correct	99 ms	6244 KB	Output is correct
79	Incorrect	90 ms	6260 KB	Output isn't correct
80	Incorrect	79 ms	6260 KB	Output isn't correct
81	Incorrect	80 ms	6212 KB	Output isn't correct
82	Incorrect	79 ms	6248 KB	Output isn't correct
83	Incorrect	94 ms	6324 KB	Output isn't correct
84	Incorrect	82 ms	6292 KB	Output isn't correct
85	Incorrect	84 ms	6360 KB	Output isn't correct
86	Incorrect	87 ms	6252 KB	Output isn't correct
87	Incorrect	91 ms	6256 KB	Output isn't correct
88	Incorrect	85 ms	6256 KB	Output isn't correct
89	Incorrect	94 ms	6268 KB	Output isn't correct
90	Incorrect	98 ms	6296 KB	Output isn't correct
91	Incorrect	91 ms	6256 KB	Output isn't correct
92	Incorrect	96 ms	6244 KB	Output isn't correct