oj.uz

Submission #480599

# Submission time Handle Problem Language Result Execution time Memory
480599 2021-10-17T10:38:40 Z EntropyX Mecho (IOI09_mecho) C++17
64 / 100
 431 ms 6304 KB 
#include<bits/stdc++.h>
#define _ ios_base::sync_with_stdio(0);cin.tie(0);

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define iiordered_set tree<pll, null_type,less<pll>, rb_tree_tag,tree_order_statistics_node_update>

using namespace std;

//Bit Functions
#define gcd __gcd
#define lsb __builtin_ffs
#define ldz __builtin_clz
#define tlz __builtin_ctz
#define stc __builtin_popcount
#define prtb(n) cout << bitset<20>(n) << "\n";

//Debugging
#define error(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
#define what_is(x) cerr << #x << " is " << x << endl;
void err(istream_iterator<string> it) {}
template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
    cerr << *it << " = " << a << endl;
    err(++it, args...);
}

//STL Declarations
#define vi vector<int>
#define vvi vector<vi>
#define vl vector<long long int>
#define vvl vector<vl>
#define vb vector<bool>
#define pii pair<int,int>
#define fr first
#define sc second
#define u_s unordered_set
#define ump unordered_map
#define ins insert
#define p_q(x) priority_queue<x>

//STL Functions
#define mt make_tuple
#define eb emplace_back
#define rep(i, begin, end) for (__typeof(end) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))
#define muq make_unique
#define all(x) x.begin(),x.end()
#define rot(vec,k) rotate(vec.begin(), vec.begin() + k, vec.end());
#define bs(vec,key) binary_search(all(vec), key)
#define parti(vec,p) partition_point(all(vec), p) - vec.begin()
#define srt(cnt) sort(all(cnt))
#define lb(cnt,x) lower_bound(all(cnt),x)
#define ub(cnt,x) upper_bound(all(cnt),x)
#define mxm(cnt) *max_element(all(cnt))
#define mnm(cnt) *min_element(all(cnt))
#define mxmptr(cnt) max_element(all(cnt))
#define mnmptr(cnt) min_element(all(cnt))
#define rev(cnt) reverse(all(cnt))
#define accum(cnt) accumulate(all(cnt),0)
#define look(cnt) for(auto c:cnt) cout<<c<<" "; cout<<"\n";
#define pre(x,cont) find(all(cont),x)!=cont.end()
#define pb push_back

//Input Functions
template<class T> istream& operator >> (istream &is , vector<T> &v) { for(T &a : v) is >> a; return is; }
template<class T> ostream& operator << (ostream &os , const vector<T> &v) { for(const T &t : v) os << t<<" "; return os << endl; }
template<class T, class U> ostream& operator << (ostream &os , const pair<T, U> &v) { return os << v.first << " " << v.second ; }

typedef long long int ll;
ll mod = 10000000007;

//Generalised Sum Function
int sum() { return 0; }
template<typename T, typename... Args>
T sum(T a, Args... args) { return a + sum(args...); }

vector<int> seive(int N){
    vector<bool> visited(N+1,false);
    vi pr;
    for(int i=2;i<=N;i++){
        if(!visited[i]){
            int j = i;
            pr.pb(j);
            while(j<=N){visited[j] = true;j+=i;}}}
    return pr;
}
ll ceil(ll a,ll b){
    if(b<0)a=-a,b=-b;
    if(a>=0)return (a+b-1)/b;
    return a/b;
}
long long bpow(long long a, long long b, long long m) {
    a %= m;
    long long res = 1;
    while (b > 0) {
        if (b & 1)res = res * a % m;
        a = a * a % m;
        b >>= 1;
    }
    return res;
}
ll inverse(ll a,ll m=mod)
{
    return bpow(a,m-2,m);
}
vvl matmul(const vvl &a,const vvl &b,ll M=mod)
{
    int n=a.size(),m=a[0].size(),l=b[0].size();
    assert(m==b.size());
    vvl c(n,vl(l,0));
    rep(i,0,n)
        rep(j,0,l)
            rep(k,0,m)
            {
                c[i][j]=(c[i][j]+a[i][k]*b[k][j])%M;
            }
    return c;
}
vvl matpow(vvl a,ll p,ll M=mod)
{
    assert(a.size()==a[0].size());
    int n=a.size();
    vvl res(n,vl(n,0));
    rep(i,0,n)   res[i][i]=1;
    while(p>0)
    {
        if(p&1) res=matmul(res,a,M);
        a=matmul(a,a,M);
        p>>=1;
    }
    return res;
}

const ll COMBINATION_SIZE = 300005;
const ll MOD = 1e9+7;

struct Combination {
    long long fac[COMBINATION_SIZE], inv[COMBINATION_SIZE];
    bool built = 0;
    void build(){
        assert(MOD >= COMBINATION_SIZE);
        fac[0] = 1;
        for(int i = 1; i < COMBINATION_SIZE; i++) {
            fac[i] = fac[i - 1] * i % MOD;
        }
        inv[COMBINATION_SIZE - 1] = inverse(fac[COMBINATION_SIZE - 1], MOD);
        for(int i = COMBINATION_SIZE - 2; i >= 0; i--) {
            inv[i] = inv[i + 1] * (i + 1) % MOD;
        }
    }
    long long C(int x, int y){
        if(y < 0 || y > x) {
            return 0;
        }
        if(!built) {
            built = 1;
            build();
        }
        return fac[x] * inv[y] % MOD * inv[x-y] % MOD;
    }
} comb;

void setIO(string s) { // the argument is the filename without the extension
    freopen((s+".in").c_str(),"r",stdin);
    freopen((s+".out").c_str(),"w",stdout);
}

int main(){ _
    int n,s;cin >> n >> s;
    vector<string> vec(n);
    rep(i,0,n)
        cin >> vec[i];
    auto valid = [&](int x,int y){
        if(x<0 || y<0 || x>=n || y>=n)
            return false;
        return true;
    };
    vector<pii> dirs = {{+1,0},{-1,0},{0,+1},{0,-1}};
    pii start;pii end;
    queue<pii> q;
    vector<vi> d(n,vi(n,-1));
    rep(i,0,n){
        rep(j,0,n){
            if(vec[i][j] == 'H'){
                q.push({i,j});
                d[i][j] = 0;
            }
            else if(vec[i][j] == 'M'){
                start = {i,j};
            }
            else if(vec[i][j] == 'D'){
                end = {i,j};
            }
        }
    }
    // The bee action is finished!
    while(!q.empty()){
        auto p = q.front();q.pop();
        int x = p.fr;int y = p.sc;
        int dd = d[x][y];
        for(auto c:dirs){
            int X = x+c.fr;
            int Y = y+c.sc;
            if(valid(X,Y) && (d[X][Y] == -1) && vec[X][Y]!='T' && vec[X][Y]!='D'){
                q.push({X,Y});
                d[X][Y] = dd+s;
            }
        }
    }
    auto check = [&](int start_time){
        if(d[start.fr][start.sc] <= start_time)
            return false;
        queue<pii> q2;
        vector<vi> d2(n,vi(n,-1));
        q2.push(start);
        d2[start.fr][start.sc] = start_time;
        while(!q2.empty()){
            auto p = q2.front();
            q2.pop();
            int x = p.fr;
            int y = p.sc;
            int dd = d2[x][y];
            int chk = dd + 1;
            for(auto c:dirs){
                int X = x + c.fr;
                int Y = y + c.sc;
                if(valid(X,Y) && d2[X][Y] == -1 && vec[X][Y] != 'T' && (chk < d[X][Y] || d[X][Y] == -1)){
                    d2[X][Y] = chk;
                    q2.push({X,Y});
                }
            }
        }
        return d2[end.fr][end.sc]!=-1;
    };
    if(!check(0)){
        cout << "-1\n";
    }
    else{
        int r = n*n+1;
        int l = 0;
        while(r-l>1){
            int mid = (l+r)/2;
            if(check(mid)){
                l = mid;
            }
            else{
                r = mid;
            }
        }
        l = (l/s);
        cout << l << "\n";
    }
    return 0;
}

Compilation message

In file included from /usr/include/c++/10/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:45,
                 from /usr/include/c++/10/ext/pb_ds/detail/container_base_dispatch.hpp:90,
                 from /usr/include/c++/10/ext/pb_ds/assoc_container.hpp:48,
                 from mecho.cpp:4:
mecho.cpp: In function 'std::vector<std::vector<long long int> > matmul(const std::vector<std::vector<long long int> >&, const std::vector<std::vector<long long int> >&, ll)':
mecho.cpp:111:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  111 |     assert(m==b.size());
      |            ~^~~~~~~~~~
mecho.cpp: In function 'void setIO(std::string)':
mecho.cpp:166:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  166 |     freopen((s+".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:167:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  167 |     freopen((s+".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
64.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 260 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 153 ms 6096 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Incorrect 1 ms 204 KB Output isn't correct
17 Correct 1 ms 204 KB Output is correct
18 Incorrect 1 ms 332 KB Output isn't correct
19 Correct 1 ms 204 KB Output is correct
20 Incorrect 1 ms 204 KB Output isn't correct
21 Correct 1 ms 332 KB Output is correct
22 Incorrect 1 ms 332 KB Output isn't correct
23 Correct 1 ms 332 KB Output is correct
24 Incorrect 1 ms 332 KB Output isn't correct
25 Correct 1 ms 332 KB Output is correct
26 Incorrect 1 ms 332 KB Output isn't correct
27 Correct 1 ms 332 KB Output is correct
28 Incorrect 1 ms 332 KB Output isn't correct
29 Correct 1 ms 332 KB Output is correct
30 Incorrect 1 ms 332 KB Output isn't correct
31 Correct 1 ms 332 KB Output is correct
32 Incorrect 2 ms 332 KB Output isn't correct
33 Correct 7 ms 1428 KB Output is correct
34 Incorrect 30 ms 1440 KB Output isn't correct
35 Correct 43 ms 1440 KB Output is correct
36 Correct 8 ms 1740 KB Output is correct
37 Incorrect 43 ms 1816 KB Output isn't correct
38 Correct 62 ms 1916 KB Output is correct
39 Correct 11 ms 2148 KB Output is correct
40 Incorrect 54 ms 2180 KB Output isn't correct
41 Correct 78 ms 2148 KB Output is correct
42 Correct 17 ms 2596 KB Output is correct
43 Incorrect 74 ms 2600 KB Output isn't correct
44 Correct 104 ms 2612 KB Output is correct
45 Correct 17 ms 3104 KB Output is correct
46 Incorrect 95 ms 3076 KB Output isn't correct
47 Correct 127 ms 3068 KB Output is correct
48 Correct 21 ms 3628 KB Output is correct
49 Incorrect 102 ms 3736 KB Output isn't correct
50 Correct 173 ms 3588 KB Output is correct
51 Correct 23 ms 4188 KB Output is correct
52 Incorrect 122 ms 4136 KB Output isn't correct
53 Correct 192 ms 4144 KB Output is correct
54 Correct 31 ms 4772 KB Output is correct
55 Incorrect 154 ms 4744 KB Output isn't correct
56 Correct 233 ms 4832 KB Output is correct
57 Correct 35 ms 5412 KB Output is correct
58 Incorrect 180 ms 5380 KB Output isn't correct
59 Correct 227 ms 5376 KB Output is correct
60 Correct 35 ms 6156 KB Output is correct
61 Incorrect 200 ms 6092 KB Output isn't correct
62 Correct 275 ms 6100 KB Output is correct
63 Correct 147 ms 6076 KB Output is correct
64 Incorrect 431 ms 6124 KB Output isn't correct
65 Correct 222 ms 6264 KB Output is correct
66 Correct 181 ms 6068 KB Output is correct
67 Correct 35 ms 5988 KB Output is correct
68 Correct 89 ms 6108 KB Output is correct
69 Correct 89 ms 6084 KB Output is correct
70 Correct 67 ms 6132 KB Output is correct
71 Correct 58 ms 6124 KB Output is correct
72 Correct 45 ms 6088 KB Output is correct
73 Correct 63 ms 6304 KB Output is correct
74 Correct 120 ms 6140 KB Output is correct
75 Correct 105 ms 6096 KB Output is correct
76 Correct 85 ms 6112 KB Output is correct
77 Correct 99 ms 6208 KB Output is correct
78 Correct 35 ms 6084 KB Output is correct
79 Correct 112 ms 6108 KB Output is correct
80 Correct 99 ms 6092 KB Output is correct
81 Correct 103 ms 6120 KB Output is correct
82 Correct 101 ms 6108 KB Output is correct
83 Correct 136 ms 6096 KB Output is correct
84 Correct 159 ms 6160 KB Output is correct
85 Correct 121 ms 6100 KB Output is correct
86 Correct 141 ms 6104 KB Output is correct
87 Correct 134 ms 6200 KB Output is correct
88 Correct 148 ms 6196 KB Output is correct
89 Correct 190 ms 6092 KB Output is correct
90 Correct 138 ms 6084 KB Output is correct
91 Correct 151 ms 6100 KB Output is correct
92 Correct 156 ms 6160 KB Output is correct