Submission #913618

#	Time	Username	Problem	Language	Result	Execution time	Memory
913618		marvinthang	Robot Contest (IOI23_robot)	C++17	100 / 100	149 ms	6248 KiB

robot

/*************************************
*    author: marvinthang             *
*    created: 20.01.2024 13:51:08    *
*************************************/

#include "robot.h"
#include <bits/stdc++.h>

using namespace std;

#define                  fi  first
#define                  se  second
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define              ALL(v)  (v).begin(), (v).end()
#define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
#define          REPD(i, n)  for (int i = (n); i-- > 0; )
#define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i) 
#define       FORD(i, b, a)  for (int i = (b), _a = (a); --i >= _a; ) 
#define       FORE(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i) 
#define      FORDE(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i) 
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
    #include "debug.h"
#else
    #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
    #define DB(...) 23
    #define db(...) 23
    #define debug(...) 23
#endif

template <class U, class V> scan_op(pair <U, V>)  { return in >> u.first >> u.second; }
template <class T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")";  else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }

// end of template

const char cdir[] = {'W', 'S', 'E', 'N'};
const char STAY = 'H';
const char TERMINATE = 'T';

const int BOUNDARY = -2;
const int OBSTACLE = -1;

const int PATH = 4;
const int EMPTY = 5;

void program_pulibot() {
    auto get_instruction = [] (int cur, vector <int> S) {
        cur = 5 - cur;
        for (int &x: S) if (x >= 0) x = 5 - x;
        // bfs
        bool source = S[0] == BOUNDARY && S[3] == BOUNDARY;
        bool sink = S[1] == BOUNDARY && S[2] == BOUNDARY;
        if (cur == EMPTY) {
            if (source) {
                REP(i, 4) if (S[i] == EMPTY) return pair{i, cdir[i]};
            } else if (!sink) {
                REP(i, 4) if (S[i] == (i ^ 2)) return pair{i, cdir[i]};
            } else {
                REP(i, 4) if (S[i] == (i ^ 2)) return pair{1, cdir[i]};
            }
        } else if (S[cur] == (cur ^ 2)) {
            REP(love, 4) {
                cur = (cur + 1) & 3;
                if (S[cur] == EMPTY || S[cur] == (cur ^ 2)) return pair{cur, cdir[cur]};
            }
        } else {
            REP(i, 4) if (S[i] == (i ^ 2)) return pair{cur, cdir[i]};
            if (source) return pair{PATH, cdir[cur]};
            REP(i, 4) if (S[i] == PATH) return sink ? pair{PATH, TERMINATE} : pair{PATH, cdir[cur]};
            return pair{EMPTY, cdir[cur]};
        }
        return pair{-1, ' '};
    };
    REP(cur, 6) if (cur != 5 - PATH) FOR(w, -2, 6) FOR(s, -2, 6) FOR(e, -2, 6) FOR(n, -2, 6) {
        auto [z, a] = get_instruction(cur, {w, s, e, n});
        if (z != -1) set_instruction({cur, w, s, e, n}, 5 - z, a);

    }
}

• Subtask 0: 0 / 0
• Subtask 1: 6 / 6
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 20 / 20
• Subtask 5: 46 / 46