oj.uz

Submission #46116

# Submission time Handle Problem Language Result Execution time Memory
46116 2018-04-17T10:27:53 Z RockyB Robots (APIO13_robots) C++17
100 / 100
 1025 ms 72888 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 49 ms 68088 KB Output is correct
2 Correct 50 ms 68328 KB Output is correct
3 Correct 64 ms 68328 KB Output is correct
4 Correct 62 ms 68372 KB Output is correct
5 Correct 52 ms 68392 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 68088 KB Output is correct
2 Correct 50 ms 68328 KB Output is correct
3 Correct 64 ms 68328 KB Output is correct
4 Correct 62 ms 68372 KB Output is correct
5 Correct 52 ms 68392 KB Output is correct
6 Correct 60 ms 68392 KB Output is correct
7 Correct 49 ms 68392 KB Output is correct
8 Correct 50 ms 68392 KB Output is correct
9 Correct 50 ms 68392 KB Output is correct
10 Correct 50 ms 68392 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 68088 KB Output is correct
2 Correct 50 ms 68328 KB Output is correct
3 Correct 64 ms 68328 KB Output is correct
4 Correct 62 ms 68372 KB Output is correct
5 Correct 52 ms 68392 KB Output is correct
6 Correct 60 ms 68392 KB Output is correct
7 Correct 49 ms 68392 KB Output is correct
8 Correct 50 ms 68392 KB Output is correct
9 Correct 50 ms 68392 KB Output is correct
10 Correct 50 ms 68392 KB Output is correct
11 Correct 181 ms 70360 KB Output is correct
12 Correct 56 ms 70360 KB Output is correct
13 Correct 84 ms 70360 KB Output is correct
14 Correct 371 ms 70512 KB Output is correct
15 Correct 157 ms 70512 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 68088 KB Output is correct
2 Correct 50 ms 68328 KB Output is correct
3 Correct 64 ms 68328 KB Output is correct
4 Correct 62 ms 68372 KB Output is correct
5 Correct 52 ms 68392 KB Output is correct
6 Correct 60 ms 68392 KB Output is correct
7 Correct 49 ms 68392 KB Output is correct
8 Correct 50 ms 68392 KB Output is correct
9 Correct 50 ms 68392 KB Output is correct
10 Correct 50 ms 68392 KB Output is correct
11 Correct 181 ms 70360 KB Output is correct
12 Correct 56 ms 70360 KB Output is correct
13 Correct 84 ms 70360 KB Output is correct
14 Correct 371 ms 70512 KB Output is correct
15 Correct 157 ms 70512 KB Output is correct
16 Correct 212 ms 70512 KB Output is correct
17 Correct 1025 ms 72888 KB Output is correct
18 Correct 305 ms 72888 KB Output is correct
19 Correct 296 ms 72888 KB Output is correct
20 Correct 751 ms 72888 KB Output is correct