oj.uz

Submission #762817

# Submission time Handle Problem Language Result Execution time Memory
762817 2023-06-21T19:54:36 Z bLIC Mecho (IOI09_mecho) C++17
100 / 100
 192 ms 11456 KB 
/**
 *  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(){
    ll n, s;cin>>n>>s;
    vector<string> grid(n);
    for (int i = 0;i<n;i++) cin>>grid[i];

    vvl beetime(n, vl(n, INFLL));
    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();
        ll tim = beetime[x][y] + s;
        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);
        }
    }
    int mx, my;

    int fx, fy;
    for (int i = 0;i<n;i++){
        for (int j = 0;j<n;j++){
            if (grid[i][j]=='M'){
                mx = i, my = j;
            } else if (grid[i][j]=='D') fx=i, fy = j;
        }
    }
    auto check = [&](ll m){
        vvl mtim(n, vl(n, INF));
        queue<array<ll, 2>> qq;
        vector<vector<bool>> poss(n, vector<bool>(n, false));
        qq.push({mx, my});
        mtim[mx][my] = m*s;
        if (mtim[mx][my]>=beetime[mx][my]) return false;
        while(!qq.empty()){
            auto [x, y] = qq.front();qq.pop();
            poss[x][y] = true;
            ll 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 || yy<0 || xx>=n || yy>=n || grid[xx][yy]=='T' || tim>=beetime[xx][yy] || tim>=mtim[xx][yy]){
                    continue;
                }
                mtim[xx][yy] = tim;
                qq.push({xx, yy});
            }
        }
        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<<" "<<r<<endl;
    } 
    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:208:14: warning: unused variable 'i' [-Wunused-variable]
  208 |     int t=1, i = 1;
      |              ^
mecho.cpp: In function 'void solve()':
mecho.cpp:157:20: warning: 'fx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  157 |         if (poss[fx][fy]) return true;
      |                    ^
mecho.cpp:140:20: warning: 'my' may be used uninitialized in this function [-Wmaybe-uninitialized]
  140 |         mtim[mx][my] = m*s;
      |                    ^
mecho.cpp:140:16: warning: 'mx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  140 |         mtim[mx][my] = m*s;
      |                ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 100 ms 11360 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 372 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 7 ms 2428 KB Output is correct
34 Correct 8 ms 2500 KB Output is correct
35 Correct 21 ms 2444 KB Output is correct
36 Correct 8 ms 3092 KB Output is correct
37 Correct 9 ms 3072 KB Output is correct
38 Correct 28 ms 3132 KB Output is correct
39 Correct 11 ms 3836 KB Output is correct
40 Correct 11 ms 3840 KB Output is correct
41 Correct 35 ms 3804 KB Output is correct
42 Correct 13 ms 4620 KB Output is correct
43 Correct 15 ms 4624 KB Output is correct
44 Correct 50 ms 4676 KB Output is correct
45 Correct 15 ms 5516 KB Output is correct
46 Correct 15 ms 5532 KB Output is correct
47 Correct 55 ms 5552 KB Output is correct
48 Correct 22 ms 6544 KB Output is correct
49 Correct 19 ms 6520 KB Output is correct
50 Correct 69 ms 6532 KB Output is correct
51 Correct 20 ms 7636 KB Output is correct
52 Correct 26 ms 7760 KB Output is correct
53 Correct 79 ms 7620 KB Output is correct
54 Correct 33 ms 8708 KB Output is correct
55 Correct 28 ms 8724 KB Output is correct
56 Correct 100 ms 8820 KB Output is correct
57 Correct 25 ms 9952 KB Output is correct
58 Correct 27 ms 9976 KB Output is correct
59 Correct 109 ms 10000 KB Output is correct
60 Correct 31 ms 11260 KB Output is correct
61 Correct 35 ms 11344 KB Output is correct
62 Correct 126 ms 11368 KB Output is correct
63 Correct 112 ms 11376 KB Output is correct
64 Correct 168 ms 11324 KB Output is correct
65 Correct 192 ms 11328 KB Output is correct
66 Correct 131 ms 11360 KB Output is correct
67 Correct 108 ms 11412 KB Output is correct
68 Correct 79 ms 11312 KB Output is correct
69 Correct 75 ms 11344 KB Output is correct
70 Correct 58 ms 11348 KB Output is correct
71 Correct 64 ms 11308 KB Output is correct
72 Correct 59 ms 11424 KB Output is correct
73 Correct 66 ms 11348 KB Output is correct
74 Correct 73 ms 11380 KB Output is correct
75 Correct 78 ms 11428 KB Output is correct
76 Correct 78 ms 11420 KB Output is correct
77 Correct 79 ms 11360 KB Output is correct
78 Correct 83 ms 11360 KB Output is correct
79 Correct 72 ms 11380 KB Output is correct
80 Correct 79 ms 11436 KB Output is correct
81 Correct 86 ms 11328 KB Output is correct
82 Correct 72 ms 11336 KB Output is correct
83 Correct 88 ms 11292 KB Output is correct
84 Correct 85 ms 11320 KB Output is correct
85 Correct 81 ms 11328 KB Output is correct
86 Correct 95 ms 11456 KB Output is correct
87 Correct 97 ms 11400 KB Output is correct
88 Correct 94 ms 11440 KB Output is correct
89 Correct 98 ms 11456 KB Output is correct
90 Correct 117 ms 11420 KB Output is correct
91 Correct 95 ms 11416 KB Output is correct
92 Correct 92 ms 11392 KB Output is correct