oj.uz

Submission #38910

# Submission time Handle Problem Language Result Execution time Memory
38910 2018-01-07T19:10:28 Z qoo2p5 Robots (APIO13_robots) C++14
60 / 100
 1500 ms 124588 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int INF = (int) 1e9 + 1e6 + 123;
const ll LINF = (ll) 1e18 + 1e9 + 123;
const ld EPS = (ld) 1e-7;
const ll MOD = (ll) 1e9 + 7;

#define sz(x) (int) (x).size()
#define mp(x, y) make_pair(x, y)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lb(s, t, x) (int) (lower_bound(s, t, x) - s)
#define ub(s, t, x) (int) (upper_bound(s, t, x) - s)
#define rep(i, f, t) for (int i = f; i < t; i++)
#define per(i, f, t) for (int i = f; i >= t; i--)

ll power(ll x, ll y, ll mod = MOD) {
    if (y == 0) {
        return 1;
    }
    if (y & 1) {
        return power(x, y - 1, mod) * x % mod;
    } else {
        ll tmp = power(x, y / 2, mod);
        return tmp * tmp % mod;
    }
}

template<typename A, typename B> bool mini(A &x, const B &y) {
    if (y < x) {
        x = y;
        return true;
    }
    return false;
}

template<typename A, typename B> bool maxi(A &x, const B &y) {
    if (y > x) {
        x = y;
        return true;
    }
    return false;
}

void add(ll &x, ll y) {
	x += y;
	if (x >= MOD) x -= MOD;
	if (x < 0) x += MOD;
}

ll mult(ll x, ll y) {
	return x * y % MOD;
}

void run();

#define TASK ""

int main() {
#ifdef LOCAL
    if (strlen(TASK) > 0) {
        cerr << "Reminder: you are using file i/o, filename: " TASK "!" << endl << endl;
    }
#endif
#ifndef LOCAL
    if (strlen(TASK)) {
        freopen(TASK ".in", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
#endif
    cout << fixed << setprecision(12);
    run();
    return 0;
}

// == SOLUTION == //

const int N = 10;
const int W = 505;

const int dx[4] = {-1, 0, 1, 0};
const int dy[4] = {0, -1, 0, 1};

int n, w, h;
int dp[N][N][W][W];
string f[W];
pair<pair<int, int>, int> step[W][W][4];
pair<int, int> nxt[W][W][4];
bool used[W][W];

bool can_go(int x, int y) {
	return 0 <= x && x < h && 0 <= y && y < w && f[x][y] != 'x';
}

void dfs(int x, int y, int dir) {
	if (nxt[x][y][dir].first != -3) {
		return;
	}
	
	if (step[x][y][dir].first.first == -1) {
		nxt[x][y][dir] = {x, y};
		return;
	}
	
	nxt[x][y][dir] = {-2, -2};
	int tx = step[x][y][dir].first.first;
	int ty = step[x][y][dir].first.second;
	int tdir = step[x][y][dir].second;
	if (nxt[tx][ty][tdir].first == -2) {
		nxt[x][y][dir] = {-1, -1};
		return;
	}
	
	dfs(tx, ty, tdir);
	if (nxt[tx][ty][tdir].first == -1) {
		nxt[x][y][dir] = {-1, -1};
		return;
	}
	
	nxt[x][y][dir] = nxt[tx][ty][tdir];
}

void run() {
	cin >> n >> w >> h;
	
	rep(i, 0, N) {
		rep(j, 0, N) {
			rep(t, 0, W) {
				rep(k, 0, W) {
					dp[i][j][t][k] = INF;
				}
			}
		}
	}
	
	rep(i, 0, h) {
		cin >> f[i];
		rep(j, 0, w) {
			if ('1' <= f[i][j] && f[i][j] <= '9') {
				int id = f[i][j] - '1';
				dp[id][id + 1][i][j] = 0;
			}
		}
	}
	
	rep(i, 0, h) {
		rep(j, 0, w) {
			rep(dir, 0, 4) {
				int tdir = dir;
				if (f[i][j] == 'A') {
					tdir = (tdir + 1) % 4;
				} else if (f[i][j] == 'C') {
					tdir = (tdir + 3) % 4;
				}
				int nx = i + dx[tdir];
				int ny = j + dy[tdir];
				if (!can_go(nx, ny)) {
					step[i][j][dir] = {{-1, -1}, -1};
				} else {
					step[i][j][dir] = {{nx, ny}, tdir};
				}
				
				nxt[i][j][dir] = {-3, -3};
			}
		}
	}
	
	rep(i, 0, h) {
		rep(j, 0, w) {
			rep(dir, 0, 4) {
				dfs(i, j, dir);
			}
		}
	}
	
	priority_queue<pair<int, pair<int, int>>> q;
	
	rep(len, 1, n + 1) {
		rep(l, 0, n - len + 1) {
			int r = l + len;
			rep(k, l + 1, r) {
				rep(x, 0, h) {
					rep(y, 0, w) {
						mini(dp[l][r][x][y], dp[l][k][x][y] + dp[k][r][x][y]);
					}
				}
			}
			
			memset(used, 0, sizeof used);
			rep(x, 0, h) {
				rep(y, 0, w) {
					if (dp[l][r][x][y] != INF) {
						q.push({-dp[l][r][x][y], {x, y}});
					}
				}
			}
			
			while (!q.empty()) {
				auto it = q.top();
				q.pop();
				int x = it.second.first;
				int y = it.second.second;
				if (used[x][y]) {
					continue;
				}
				
				used[x][y] = 1;
				rep(dir, 0, 4) {
					int nx = nxt[x][y][dir].first;
					int ny = nxt[x][y][dir].second;
					if (nx != -1 && mini(dp[l][r][nx][ny], dp[l][r][x][y] + 1)) {
						q.push({-dp[l][r][nx][ny], {nx, ny}});
					}
				}
			}
		}
	}
	
	int ans = INF;
	rep(i, 0, h) {
		rep(j, 0, w) {
			mini(ans, dp[0][n][i][j]);
		}
	}
	cout << (ans == INF ? -1 : ans) << "\n";
}

Compilation message

robots.cpp: In function 'int main()':
robots.cpp:72:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(TASK ".in", "r", stdin);
                                        ^
robots.cpp:73:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(TASK ".out", "w", stdout);
                                          ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 121988 KB Output is correct
2 Correct 19 ms 121988 KB Output is correct
3 Correct 26 ms 121988 KB Output is correct
4 Correct 13 ms 121988 KB Output is correct
5 Correct 6 ms 121988 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 121988 KB Output is correct
2 Correct 19 ms 121988 KB Output is correct
3 Correct 26 ms 121988 KB Output is correct
4 Correct 13 ms 121988 KB Output is correct
5 Correct 6 ms 121988 KB Output is correct
6 Correct 13 ms 121988 KB Output is correct
7 Correct 26 ms 121988 KB Output is correct
8 Correct 26 ms 121988 KB Output is correct
9 Correct 16 ms 121988 KB Output is correct
10 Correct 23 ms 121988 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 121988 KB Output is correct
2 Correct 19 ms 121988 KB Output is correct
3 Correct 26 ms 121988 KB Output is correct
4 Correct 13 ms 121988 KB Output is correct
5 Correct 6 ms 121988 KB Output is correct
6 Correct 13 ms 121988 KB Output is correct
7 Correct 26 ms 121988 KB Output is correct
8 Correct 26 ms 121988 KB Output is correct
9 Correct 16 ms 121988 KB Output is correct
10 Correct 23 ms 121988 KB Output is correct
11 Correct 196 ms 122700 KB Output is correct
12 Correct 33 ms 121988 KB Output is correct
13 Correct 39 ms 122120 KB Output is correct
14 Correct 706 ms 123276 KB Output is correct
15 Correct 96 ms 122504 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 121988 KB Output is correct
2 Correct 19 ms 121988 KB Output is correct
3 Correct 26 ms 121988 KB Output is correct
4 Correct 13 ms 121988 KB Output is correct
5 Correct 6 ms 121988 KB Output is correct
6 Correct 13 ms 121988 KB Output is correct
7 Correct 26 ms 121988 KB Output is correct
8 Correct 26 ms 121988 KB Output is correct
9 Correct 16 ms 121988 KB Output is correct
10 Correct 23 ms 121988 KB Output is correct
11 Correct 196 ms 122700 KB Output is correct
12 Correct 33 ms 121988 KB Output is correct
13 Correct 39 ms 122120 KB Output is correct
14 Correct 706 ms 123276 KB Output is correct
15 Correct 96 ms 122504 KB Output is correct
16 Correct 113 ms 122252 KB Output is correct
17 Execution timed out 1500 ms 124588 KB Execution timed out
18 Halted 0 ms 0 KB -