oj.uz

Submission #46114

# Submission time Handle Problem Language Result Execution time Memory
46114 2018-04-17T10:27:06 Z RockyB Robots (APIO13_robots) C++17
100 / 100
 812 ms 103216 KB 
/// In The Name Of God
 
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#include <bits/stdc++.h>
 
#define f first
#define s second
 
#define pb emplace_back
#define pp pop_back
#define mp make_pair
 
#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()
 
#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
 
#define nl '\n'
#define ioi exit(0);
 
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
 
const int N = (int)500 + 1;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;
 
const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};
 
using namespace std;
 
int n, m, h;
char a[N][N];
 
int dp[55][N][N];
int id[10][10];
 
pair <int, int> res[N][N][4];
bool add[N][N][4];
bool was[N][N][4];
 

vector < pair <int, int> > q[N * N];
 
inline bool check(int x, int y) {
	return 0 <= x && x < n && 0 <= y && y < m && a[x][y] != 'x';
}
inline pair <int, int> go(int x, int y, int t) {
	if (a[x][y] == 'C') t = (t + 1) % 4;
	else if (a[x][y] == 'A') t = (t + 3) % 4;
	if (was[x][y][t]) return res[x][y][t];
	was[x][y][t] = 1;
	if (check(x + dx[t], y + dy[t])) return res[x][y][t] = go(x + dx[t], y + dy[t], t);
	return res[x][y][t] = {x, y};
}
 
int tin[N][N];
int main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
	#endif
	scanf ("%d%d%d", &h, &m, &n);
 
	int tmr = 0;
	for (int i = 0; i <= h; ++i) {
		for (int j = i; j <= h; ++j) {
			id[i][j] = tmr++;
		}
	}
	memset(dp, 0x3f, sizeof(dp));
	memset(res, -1, sizeof(res));

	for (int i = 0; i < n; ++i) {
		scanf ("%s", a[i]);
		for (int j = 0; j < m; ++j) {
			if (isdigit(a[i][j])) {
				int d = a[i][j] - '1';
				dp[id[d][d]][i][j] = 0;
			}
		}
	}	
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < m; ++j) {
			if (check(i, j)) {
				for (int t = 0; t < 4; t++) {
					go(i, j, t);
				}
			}
		}
	}

	tmr = 0;
	for (int len = 0; len < h; len++) {
		for (int l = 0; l + len < h; l++) {
			int r = l + len;
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < m; j++) {
					for (int mid = l; mid < r; mid++) {
						dp[id[l][r]][i][j] = min(dp[id[l][r]][i][j], dp[id[l][mid]][i][j] + dp[id[mid + 1][r]][i][j]);
					}
				}
			}

			for (int i = 0; i < n; i++) {
				for (int j = 0; j < m; j++) {
					if (dp[id[l][r]][i][j] < inf) q[dp[id[l][r]][i][j]].pb(mp(i, j));
				}
			}

			++tmr;
			for (int cost = 0, up = n * m; cost <= up; cost++) {
				while (sz(q[cost])) {
					pair <int, int> v = q[cost].back();
					q[cost].pp();
					tin[v.f][v.s] = tmr;
					for (int i = 0; i < 4; i++) {
						pair <int, int> to = go(v.f, v.s, i);
						if (tin[to.f][to.s] != tmr && dp[id[l][r]][to.f][to.s] > dp[id[l][r]][v.f][v.s] + 1) {
							dp[id[l][r]][to.f][to.s] = dp[id[l][r]][v.f][v.s] + 1;
							q[dp[id[l][r]][to.f][to.s]].pb(to);
						}
					}
				}
				//q[cost].shrink_to_fit();
			}

		}
	}	
	int ans = inf;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			ans = min(ans, dp[id[0][h - 1]][i][j]);
		}
	}
	if (ans >= inf) ans = -1;
	cout << ans;
	ioi
}

Compilation message

robots.cpp: In function 'int main()':
robots.cpp:68:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%d%d", &h, &m, &n);
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
robots.cpp:80:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%s", a[i]);
   ~~~~~~^~~~~~~~~~~~
robots.cpp:105:91: warning: array subscript is above array bounds [-Warray-bounds]
       dp[id[l][r]][i][j] = min(dp[id[l][r]][i][j], dp[id[l][mid]][i][j] + dp[id[mid + 1][r]][i][j]);
                                                                              ~~~~~~~~~~~~~^
robots.cpp:105:88: warning: array subscript is above array bounds [-Warray-bounds]
       dp[id[l][r]][i][j] = min(dp[id[l][r]][i][j], dp[id[l][mid]][i][j] + dp[id[mid + 1][r]][i][j]);
                                                                              ~~~~~~~~~~^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 68088 KB Output is correct
2 Correct 50 ms 68220 KB Output is correct
3 Correct 49 ms 68292 KB Output is correct
4 Correct 49 ms 68320 KB Output is correct
5 Correct 52 ms 68352 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 68088 KB Output is correct
2 Correct 50 ms 68220 KB Output is correct
3 Correct 49 ms 68292 KB Output is correct
4 Correct 49 ms 68320 KB Output is correct
5 Correct 52 ms 68352 KB Output is correct
6 Correct 49 ms 68352 KB Output is correct
7 Correct 51 ms 68352 KB Output is correct
8 Correct 49 ms 68352 KB Output is correct
9 Correct 49 ms 68352 KB Output is correct
10 Correct 49 ms 68352 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 68088 KB Output is correct
2 Correct 50 ms 68220 KB Output is correct
3 Correct 49 ms 68292 KB Output is correct
4 Correct 49 ms 68320 KB Output is correct
5 Correct 52 ms 68352 KB Output is correct
6 Correct 49 ms 68352 KB Output is correct
7 Correct 51 ms 68352 KB Output is correct
8 Correct 49 ms 68352 KB Output is correct
9 Correct 49 ms 68352 KB Output is correct
10 Correct 49 ms 68352 KB Output is correct
11 Correct 141 ms 73492 KB Output is correct
12 Correct 57 ms 73492 KB Output is correct
13 Correct 79 ms 73492 KB Output is correct
14 Correct 285 ms 78708 KB Output is correct
15 Correct 118 ms 78708 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 68088 KB Output is correct
2 Correct 50 ms 68220 KB Output is correct
3 Correct 49 ms 68292 KB Output is correct
4 Correct 49 ms 68320 KB Output is correct
5 Correct 52 ms 68352 KB Output is correct
6 Correct 49 ms 68352 KB Output is correct
7 Correct 51 ms 68352 KB Output is correct
8 Correct 49 ms 68352 KB Output is correct
9 Correct 49 ms 68352 KB Output is correct
10 Correct 49 ms 68352 KB Output is correct
11 Correct 141 ms 73492 KB Output is correct
12 Correct 57 ms 73492 KB Output is correct
13 Correct 79 ms 73492 KB Output is correct
14 Correct 285 ms 78708 KB Output is correct
15 Correct 118 ms 78708 KB Output is correct
16 Correct 192 ms 78708 KB Output is correct
17 Correct 812 ms 103216 KB Output is correct
18 Correct 262 ms 103216 KB Output is correct
19 Correct 195 ms 103216 KB Output is correct
20 Correct 540 ms 103216 KB Output is correct