oj.uz

Submission #879723

# Submission time Handle Problem Language Result Execution time Memory
879723 2023-11-28T02:17:23 Z marvinthang Robots (APIO13_robots) C++17
100 / 100
 495 ms 53584 KB 
/*************************************
*    author: marvinthang             *
*    created: 28.11.2023 08:29:17    *
*************************************/

#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 << '}'; }
template <class A, class B> bool minimize(A &a, B b)  { if (a > b) { a = b; return true; } return false; }
template <class A, class B> bool maximize(A &a, B b)  { if (a < b) { a = b; return true; } return false; }

// end of template

const int INF = 1e9;

// anti-clockwise
const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};

void process(void) {
	int n, h, w; cin >> n >> w >> h;
	vector <string> grid(h); cin >> grid;
	auto inside = [&] (int u, int v) {
		return 0 <= u && u < h && 0 <= v && v < w && grid[u][v] != 'x';
	};
	vector id(h, vector(w, -1));
	int cnt = 0;
	REP(x, h) REP(y, w) if (inside(x, y)) {
		bool valid = false;
		if ('0' <= grid[x][y] && grid[x][y] <= '9') {
			--grid[x][y];
			valid = true;
		}
		if (!valid) REP(d, 4) if (!inside(x + dx[d], y + dy[d])) {
			valid = true;
			break;
		}
		if (valid) id[x][y] = cnt++;
	}
	vector <vector <int>> adj(cnt);
	REP(x, h) REP(y, w) if (inside(x, y)) {
		REP(d, 4) if (!inside(x + dx[d], y + dy[d])) {
			int u = x, v = y, cur_d = d;
			while (inside(u, v)) {
				if ((u != x || v != y) && id[u][v] >= 0) adj[id[u][v]].push_back(id[x][y]);
				if (grid[u][v] == 'A') cur_d = (cur_d + 3) & 3;
				else if (grid[u][v] == 'C') cur_d = (cur_d + 1) & 3;
				u -= dx[cur_d]; v -= dy[cur_d];
			}
		}
	}
	vector dp(n, vector(n, vector(cnt, INF)));
	REP(x, h) REP(y, w) if ('0' <= grid[x][y] && grid[x][y] <= '9') dp[grid[x][y] - '0'][grid[x][y] - '0'][id[x][y]] = 0;
	REPD(l, n) FOR(r, l, n) {
		vector <pair <int, int>> v;
		REP(i, cnt) {
			FOR(k, l, r) minimize(dp[l][r][i], dp[l][k][i] + dp[k + 1][r][i]);
			if (dp[l][r][i] < INF) v.emplace_back(dp[l][r][i], i);
		}
		sort(ALL(v));
		vector <int> cur, nxt;
		int ptr = 0;
		while (!cur.empty() || ptr < size(v)) {
			if (cur.empty()) {
				if (dp[l][r][v[ptr].se] == v[ptr].fi) cur.push_back(v[ptr++].se);
				else {
					ptr++;
					continue;
				}
			}
			while (ptr < size(v) && dp[l][r][v[ptr].se] == dp[l][r][cur.back()]) cur.push_back(v[ptr++].se);
			nxt.clear();
			while (!cur.empty()) {
				int u = cur.back(); cur.pop_back();
				for (int v: adj[u]) if (minimize(dp[l][r][v], dp[l][r][u] + 1)) nxt.push_back(v);
			}
			cur = move(nxt);
		}
	}
	int res = INF;
	REP(i, cnt) minimize(res, dp[0][n - 1][i]);
	cout << (res == INF ? -1 : res) << '\n';
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
	file("robots");
	// int t; cin >> t; while (t--)
	process();
	// cerr << "Time elapsed: " << TIME << " s.\n";
	return (0^0);
}

Compilation message

robots.cpp: In function 'void process()':
robots.cpp:96:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |   while (!cur.empty() || ptr < size(v)) {
      |                          ~~~~^~~~~~~~~
robots.cpp:104:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  104 |    while (ptr < size(v) && dp[l][r][v[ptr].se] == dp[l][r][cur.back()]) cur.push_back(v[ptr++].se);
      |           ~~~~^~~~~~~~~
robots.cpp: In function 'int main()':
robots.cpp:30:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:120:2: note: in expansion of macro 'file'
  120 |  file("robots");
      |  ^~~~
robots.cpp:30:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:120:2: note: in expansion of macro 'file'
  120 |  file("robots");
      |  ^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 65 ms 18876 KB Output is correct
12 Correct 6 ms 3676 KB Output is correct
13 Correct 22 ms 13572 KB Output is correct
14 Correct 157 ms 19036 KB Output is correct
15 Correct 40 ms 19036 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 65 ms 18876 KB Output is correct
12 Correct 6 ms 3676 KB Output is correct
13 Correct 22 ms 13572 KB Output is correct
14 Correct 157 ms 19036 KB Output is correct
15 Correct 40 ms 19036 KB Output is correct
16 Correct 16 ms 4956 KB Output is correct
17 Correct 495 ms 52816 KB Output is correct
18 Correct 106 ms 53072 KB Output is correct
19 Correct 77 ms 53584 KB Output is correct
20 Correct 305 ms 53020 KB Output is correct