Submission #339288

#	Time	Username	Problem	Language	Result	Execution time	Memory
339288		12tqian	Nautilus (BOI19_nautilus)	C++17	66 / 100	1096 ms	7804 KiB

nautilus

#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/rope>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

const double PI = 4 * atan(1);

#define sz(x) (int)(x).size()
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define vi vector<int>
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define vpi vector<pair<int, int>>
#define vpd vector<pair<double, double>>
#define pd pair<double, double>

#define f0r(i,a) for(int i=0;i<a;i++)
#define f1r(i,a,b) for(int i=a;i<b;i++)
#define trav(a, x) for (auto& a : x)

template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
  cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";
}

void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
}
void io(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
   // freopen(FOUT, "w", stdout);
    fast_io();
}
const int MAX = 2505;
int grid[MAX][MAX];
int use[MAX][MAX];
int r, c, m;
inline int valid(int x, int y){
    if(0<= x && x<r &&0<= y && y<c && grid[x][y] == 0 && use[x][y] == 0) {
        use[x][y] = 1;
        return 1;
    }
    return 0;
}
///0 up 1 right 2 down 3 left
int dir[4][2] = {{-1, 0}, {0, 1}, {1, 0}, {0, -1}};
vi v;
int main(){
    fast_io();
    cin >> r >> c >> m;
    string temporary;
    getline(cin, temporary);
    f0r(i, r){
        string line;
        getline(cin, line);
        f0r(j, c){
            if(line[j] == '#') grid[i][j] = 1;
        }
    }
    string line;
    getline(cin, line);
    f0r(i, m){
        if(line[i] == 'N'){
            v.eb(0);
        }
        else if(line[i] == 'E'){
            v.eb(1);
        }
        else if (line[i] == 'S'){
            v.eb(2);
        }
        else if(line[i] == 'W'){
            v.eb(3);
        }
        else{
            v.eb(-1);
        }
    }
    vpi from;
    vpi to;
    f0r(i, r){
        f0r(j, c){
            if(grid[i][j] == 0) from.eb(mp(i, j));
        }
    }
    f0r(i, m){
        to.clear();
        for(auto x: from){
            if(v[i] != -1){
                pii nxt = x;
                nxt.f += dir[v[i]][0];
                nxt.s += dir[v[i]][1];
                if(valid(nxt.f, nxt.s)){
                    to.eb(nxt);
                }
            }
            else{
                f0r(d, 4){
                    pii nxt = x;
                    nxt.f += dir[d][0];
                    nxt.s += dir[d][1];
                    if(valid(nxt.f, nxt.s)){
                        to.eb(nxt);
                    }
                }
            }
        }
        for(auto x: to){
            use[x.f][x.s] = 0;
        }
        swap(to, from);
    }
    cout << sz(from) << endl;
    return 0;
}

Compilation message (stderr)

nautilus.cpp:1: warning: ignoring #pragma comment  [-Wunknown-pragmas]
    1 | #pragma comment(linker, "/stack:200000000")
      | 
nautilus.cpp: In function 'void io(std::string)':
nautilus.cpp:53:17: warning: unused variable 'FOUT' [-Wunused-variable]
   53 |     const char* FOUT = fout.c_str();
      |                 ^~~~
nautilus.cpp:54:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   54 |     freopen(FIN, "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~

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