結果
| 問題 |
No.348 カゴメカゴメ
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-01-23 22:44:38 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
AC
|
| 実行時間 | 1,400 ms / 2,000 ms |
| コード長 | 4,715 bytes |
| コンパイル時間 | 1,117 ms |
| コンパイル使用メモリ | 126,532 KB |
| 実行使用メモリ | 178,544 KB |
| 最終ジャッジ日時 | 2024-06-13 03:35:47 |
| 合計ジャッジ時間 | 22,121 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 53 |
ソースコード
import std.conv, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.container, std.math, std.numeric, std.range, std.regex, std.typecons;
import core.bitop;
class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }
bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }
int binarySearch(T)(in T[] as, in bool delegate(T) test) { int low = -1, upp = cast(int)(as.length); for (; low + 1 < upp; ) { int mid = (low + upp) >> 1; (test(as[mid]) ? low : upp) = mid; } return upp; }
int lowerBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a < val)); }
int upperBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a <= val)); }
int root(int[] uf, int u) {
return (uf[u] < 0) ? u : (uf[u] = uf.root(uf[u]));
}
bool connect(int[] uf, int u, int v) {
u = uf.root(u);
v = uf.root(v);
if (u == v) return false;
if (uf[u] > uf[v]) swap(u, v);
uf[u] += uf[v];
uf[v] = u;
return true;
}
int M, N;
string[] A;
int[][] G;
int[] scores;
// (discard, use)
Tuple!(int, int) dfs(int u) {
auto ret = tuple(0, scores[u]);
foreach (v; G[u]) {
auto res = dfs(v);
ret[0] += max(res[0], res[1]);
ret[1] += res[0];
}
return ret;
}
void main() {
try {
for (; ; ) {
M = readInt();
N = readInt();
A = new string[M + 2];
foreach (x; [0, M + 1]) {
foreach (y; 0 .. N + 2) {
A[x] ~= ".";
}
}
foreach (x; 1 .. M + 1) {
A[x] = "." ~ readToken() ~ ".";
}
M += 2;
N += 2;
auto uf = new int[M * N];
uf[] = -1;
foreach (x; 0 .. M) foreach (y; 0 .. N) {
if (A[x][y] == 'x') {
foreach (dir; 0 .. 4) {
const xx = x + [+1, +1, 0, -1, -1, -1, 0, +1][dir];
const yy = y + [0, +1, +1, +1, 0, -1, -1, -1][dir];
if (0 <= xx && xx < M && 0 <= yy && yy < N && A[xx][yy] == 'x') {
uf.connect(x * N + y, xx * N + yy);
}
}
}
}
int V = 1;
auto ids = new int[][](M, N);
foreach (x; 0 .. M) foreach (y; 0 .. N) {
ids[x][y] = -1;
}
foreach (x; 0 .. M) foreach (y; 0 .. N) {
if (A[x][y] == 'x' && uf[x * N + y] < 0) {
ids[x][y] = V++;
}
}
foreach (x; 0 .. M) foreach (y; 0 .. N) {
if (A[x][y] == 'x') {
const r = uf.root(x * N + y);
ids[x][y] = ids[r / N][r % N];
}
}
debug {
writeln("ids");
foreach (x; 0 .. M) {
writeln(ids[x]);
}
}
// 0-1 BFS from outside
// (depth, last ring)
auto q = DList!(Tuple!(int, int))();
auto d = new Tuple!(int, int)[][](M, N);
auto vis = new bool[][](M, N);
foreach (x; 0 .. M) foreach (y; 0 .. N) {
d[x][y] = tuple(M * N, -1);
vis[x][y] = false;
}
d[0][0] = tuple(0, 0);
q.insertBack(tuple(0, 0));
for (; !q.empty; ) {
const x = q.front[0];
const y = q.front[1];
q.removeFront;
if (!vis[x][y]) {
vis[x][y] = true;
const cc = (A[x][y] == 'x') ? tuple(d[x][y][0] + 1, ids[x][y]) : d[x][y];
foreach (dir; 0 .. 4) {
int xx = x + [+1, 0, -1, 0][dir];
int yy = y + [0, +1, 0, -1][dir];
if (0 <= xx && xx < M && 0 <= yy && yy < N) {
if (d[xx][yy] > cc) {
d[xx][yy] = cc;
(A[x][y] == 'x') ? q.insertBack(tuple(xx, yy)) : q.insertFront(tuple(xx, yy));
}
}
}
}
}
debug {
writeln("d[][][0]");
foreach (x; 0 .. M) {
writeln(d[x].map!"a[0]");
}
writeln("d[][][1]");
foreach (x; 0 .. M) {
writeln(d[x].map!"a[1]");
}
}
G = new int[][V];
scores = new int[V];
foreach (x; 0 .. M) foreach (y; 0 .. N) {
if (A[x][y] == 'x' && uf[x * N + y] < 0) {
G[d[x][y][1]] ~= ids[x][y];
scores[ids[x][y]] = -uf[x * N + y];
}
}
debug {
writeln("G = ", G);
writeln("scores = ", scores);
}
auto res = dfs(0);
writeln(res[0]);
}
} catch (EOFException e) {
}
}