Submission #1059463

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059463		mindiyak	Nautilus (BOI19_nautilus)	C++14	66 / 100	14 ms	9820 KiB

nautilus

#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pi>> vvpi;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int M = 1e9+7;
void init(string name)
{
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
}
void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}

int r,c,m;
vi arr;
// vpi moves = {{-1,0},{0,1},{1,0},{0,-1}};
vpi moves = {{1,0},{0,-1},{-1,0},{0,1}};
vvi maps(105,vi(105,1));
int history[105][105][105];

int dfs(pi pos,int cnt){
    if(maps[pos.F][pos.S] == 1){
        return -1;
    }

    // cerr << pos.F << "," << pos.S << " " << cnt << endl;
    
    if(cnt == m){
        history[pos.F][pos.S][cnt] = 1;
        return 1;
    }

    if(history[pos.F][pos.S][cnt] != 0)return history[pos.F][pos.S][cnt];

    int val = -1;
    if(arr[cnt] == -1){
        FOR(i,0,4){
            val = max(val,dfs({pos.F+moves[i].F,pos.S+moves[i].S},cnt+1));
            if(val == 1)break;
        }
    }else{
        val = dfs({pos.F+moves[arr[cnt]].F,pos.S+moves[arr[cnt]].S},cnt+1);
    }
    history[pos.F][pos.S][cnt] = val;
    return val;
}
 
void solve()
{
    cin >> r >> c >> m;

    FOR(i,1,r+1){
        FOR(j,1,c+1){
            char a;cin >> a;
            if(a == '.'){
                maps[i][j] = 0;
            }else{                
                maps[i][j] = 1;
            }
            FOR(k,0,m)history[i][j][k] = 0;
        }
    }

    FOR(i,0,m){
        char a;cin >> a;
        if(a == 'N')arr.pb(0);
        else if(a == 'E')arr.pb(1);
        else if(a == 'S')arr.pb(2);
        else if(a == 'W')arr.pb(3);
        else arr.pb(-1);
    }

    // FOR(i,1,r+1){
    //     FOR(j,1,c+1){
    //         cerr<<maps[i][j];
    //     }cerr << endl;
    // }

    reverse(arr.begin(),arr.end());

    // for(int i:arr)cerr << i << " ";
    // cerr << endl;

    int ans = 0;
    FOR(i,1,r+1){
        FOR(j,1,c+1){
            // if(i != 2 || j != 4)continue;
            if(maps[i][j] == 0){
                ans += max(dfs({i,j},0),0);
            }
        }
    }

    cout << ans << endl;

}   
 
 
int main()
{
    fastIO();
    // init("test");
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message (stderr)

nautilus.cpp: In function 'void init(std::string)':
nautilus.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     freopen((name + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nautilus.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen((name + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 0 / 34