oj.uz

Submission #480602

# Submission time Handle Problem Language Result Execution time Memory
480602 2021-10-17T10:51:30 Z EntropyX Mecho (IOI09_mecho) C++17
67 / 100
 366 ms 6404 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};
                vec[i][j] = 'G';
            }
            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]=='G'){
                q.push({X,Y});
                d[X][Y] = dd+s;
            }
        }
    }
    d[end.fr][end.sc] = INT_MAX;
    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();
            if(p == end)
                return true;
            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]){
                    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*2;
        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
67.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 158 ms 6080 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 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 0 ms 204 KB Output is correct
16 Incorrect 0 ms 204 KB Output isn't correct
17 Correct 0 ms 204 KB Output is correct
18 Incorrect 0 ms 204 KB Output isn't correct
19 Correct 1 ms 332 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 0 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 0 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 1 ms 332 KB Output isn't correct
33 Correct 5 ms 1436 KB Output is correct
34 Incorrect 6 ms 1436 KB Output isn't correct
35 Correct 43 ms 1436 KB Output is correct
36 Correct 6 ms 1740 KB Output is correct
37 Incorrect 8 ms 1740 KB Output isn't correct
38 Correct 57 ms 1820 KB Output is correct
39 Correct 8 ms 2184 KB Output is correct
40 Incorrect 10 ms 2212 KB Output isn't correct
41 Correct 70 ms 2164 KB Output is correct
42 Correct 10 ms 2620 KB Output is correct
43 Incorrect 13 ms 2660 KB Output isn't correct
44 Correct 100 ms 2596 KB Output is correct
45 Correct 13 ms 3100 KB Output is correct
46 Incorrect 18 ms 3040 KB Output isn't correct
47 Correct 110 ms 3060 KB Output is correct
48 Correct 13 ms 3624 KB Output is correct
49 Incorrect 18 ms 3632 KB Output isn't correct
50 Correct 165 ms 3592 KB Output is correct
51 Correct 21 ms 4188 KB Output is correct
52 Incorrect 21 ms 4132 KB Output isn't correct
53 Correct 156 ms 4132 KB Output is correct
54 Correct 21 ms 4740 KB Output is correct
55 Incorrect 26 ms 4812 KB Output isn't correct
56 Correct 203 ms 4732 KB Output is correct
57 Correct 23 ms 5420 KB Output is correct
58 Incorrect 29 ms 5448 KB Output isn't correct
59 Correct 225 ms 5684 KB Output is correct
60 Correct 24 ms 6156 KB Output is correct
61 Incorrect 33 ms 6128 KB Output isn't correct
62 Correct 250 ms 6092 KB Output is correct
63 Correct 148 ms 6160 KB Output is correct
64 Correct 366 ms 6076 KB Output is correct
65 Correct 212 ms 6080 KB Output is correct
66 Correct 192 ms 6092 KB Output is correct
67 Correct 37 ms 5976 KB Output is correct
68 Correct 89 ms 6092 KB Output is correct
69 Correct 86 ms 6176 KB Output is correct
70 Correct 61 ms 6104 KB Output is correct
71 Correct 61 ms 6188 KB Output is correct
72 Correct 38 ms 6180 KB Output is correct
73 Correct 58 ms 6120 KB Output is correct
74 Correct 114 ms 6120 KB Output is correct
75 Correct 106 ms 6112 KB Output is correct
76 Correct 84 ms 6132 KB Output is correct
77 Correct 96 ms 6108 KB Output is correct
78 Correct 31 ms 6092 KB Output is correct
79 Correct 107 ms 6112 KB Output is correct
80 Correct 91 ms 6096 KB Output is correct
81 Correct 103 ms 6116 KB Output is correct
82 Correct 97 ms 6256 KB Output is correct
83 Correct 130 ms 6148 KB Output is correct
84 Correct 170 ms 6068 KB Output is correct
85 Correct 115 ms 6168 KB Output is correct
86 Correct 146 ms 6108 KB Output is correct
87 Correct 138 ms 6168 KB Output is correct
88 Correct 144 ms 6096 KB Output is correct
89 Correct 195 ms 6096 KB Output is correct
90 Correct 160 ms 6404 KB Output is correct
91 Correct 171 ms 6200 KB Output is correct
92 Correct 134 ms 6108 KB Output is correct