oj.uz

Submission #792966

# Submission time Handle Problem Language Result Execution time Memory
792966 2023-07-25T11:43:26 Z tr1ten Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 437 ms 123868 KB 
#include <cstdio>
#include <bits/stdc++.h>

using namespace std;
#include "ext/pb_ds/assoc_container.hpp"
#include "ext/pb_ds/tree_policy.hpp"
using namespace __gnu_pbds;
template<class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update> ;
template<typename T> 
using ordered_multiset = tree<T, null_type,less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;
// find_by_order(k)  returns iterator to kth element starting from 0;
// order_of_key(k) returns count of elements strictly smaller than k;
// useful defs
typedef long long ll; 
typedef vector<ll> vi;
typedef vector<vi> vii;
typedef pair<ll,ll> pi;
typedef vector<pi> vpi;
typedef unordered_map<ll,ll> mll;
#define pb push_back
#define mp make_pair
#define rep(i,a,b) for (int i = (a); i < (b); i++)
#define per(i,a,b) for (int i = (b)-1; i >= (a); i--)
#define trav(a,arr) for (auto& a: (arr))
#define sz(x) (int)(x).size()
#define mk_vec(name,sz,value) vi name(sz,value)
#define mk_mat(name,n,m,value) vii name(n, vi(m, value))
#define contains(x) find(x) != string::npos
#define tkv(vec,sz) rep(i,0,sz) cin>>vec[i]
#define srv(vec) sort(vec.begin(), vec.end())
#define all(x) x.begin(), x.end()
#define less(a,b) a<b
#define vsum(vec) accumulate(vec.begin(), vec.end(), 0L);
#define vmax(vec) *max_element(vec.begin(), vec.end());
#define vmin(vec) *min_element(vec.begin(), vec.end());
#define pvc(vec) trav(x,vec) cout<<x<<" "; cout<<endl;
#define put(x) cout<<(x)<<endl;
#define put2(x,y) cout<<(x)<<" "<<(y)<<endl;
#define put3(x,y,z) cout<<(x)<<" "<<(y)<<" "<<(z)<<endl;
#define mod(x) (x + MOD)%MOD
// debugging
#define timed(x) {auto start = chrono::steady_clock::now(); x; auto end = chrono::steady_clock::now(); auto diff = end - start; cout << chrono::duration <double, milli> (diff).count() << " ms" << endl;}


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
const ll MOD = 1e9+7;
const ll INF = 1e10+5;

// driver code
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    // freopen("input.in","r",stdin);
    // freopen("output.out","w",stdout);	  
    int T=1;
    // cin>>T;
    while(T--){
        int h,w;
        cin >> h >> w;
        string mat[h];
        rep(i,0,h){
            cin >> mat[i];
        }
        deque<pair<int,int>> q;
        q.push_back({0,0});
        int depth[h][w];
        memset(depth,0,sizeof depth);
        depth[0][0] = 1;
        int ans = 1;
        int dx[4]{1, -1, 0, 0}, dy[4]{0, 0, 1, -1};
        while (!q.empty())
        {
            auto p = q.front();
            q.pop_front();
            ans = max(ans,depth[p.first][p.second]);
            rep(i,0,4){
                int x=p.second+dx[i],y=p.first+dy[i];
                if(x<w && y<h && x>=0 && y>=0 && depth[y][x]==0 && mat[y][x]!='.'){
                    depth[y][x] = depth[p.first][p.second] + (mat[y][x] != mat[p.first][p.second]);
                    if(mat[y][x] != mat[p.first][p.second]) q.push_back({y,x});
                    else  q.push_front({y,x});
                }
            }
        }
        put(ans);
        
    }
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 1740 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 5 ms 1476 KB Output is correct
5 Correct 2 ms 724 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 320 KB Output is correct
8 Correct 1 ms 360 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 2 ms 596 KB Output is correct
11 Correct 1 ms 624 KB Output is correct
12 Correct 3 ms 852 KB Output is correct
13 Correct 2 ms 724 KB Output is correct
14 Correct 2 ms 828 KB Output is correct
15 Correct 8 ms 1740 KB Output is correct
16 Correct 7 ms 1748 KB Output is correct
17 Correct 7 ms 1748 KB Output is correct
18 Correct 4 ms 1364 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 592 KB Output is correct
2 Correct 26 ms 9600 KB Output is correct
3 Correct 156 ms 96352 KB Output is correct
4 Correct 46 ms 22564 KB Output is correct
5 Correct 111 ms 54136 KB Output is correct
6 Correct 429 ms 109624 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 2 ms 596 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 1 ms 352 KB Output is correct
13 Correct 26 ms 9532 KB Output is correct
14 Correct 19 ms 5688 KB Output is correct
15 Correct 10 ms 6176 KB Output is correct
16 Correct 13 ms 4164 KB Output is correct
17 Correct 70 ms 24392 KB Output is correct
18 Correct 67 ms 24156 KB Output is correct
19 Correct 55 ms 22640 KB Output is correct
20 Correct 48 ms 20820 KB Output is correct
21 Correct 88 ms 55952 KB Output is correct
22 Correct 106 ms 54100 KB Output is correct
23 Correct 157 ms 46644 KB Output is correct
24 Correct 90 ms 54632 KB Output is correct
25 Correct 279 ms 96264 KB Output is correct
26 Correct 414 ms 123868 KB Output is correct
27 Correct 351 ms 114588 KB Output is correct
28 Correct 437 ms 109736 KB Output is correct
29 Correct 413 ms 107228 KB Output is correct
30 Correct 395 ms 111640 KB Output is correct
31 Correct 312 ms 62040 KB Output is correct
32 Correct 405 ms 113204 KB Output is correct