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2018-02-27 15:53:03 +08:00
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notes/剑指 offer 题解.md
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@ -425,36 +425,35 @@ public int minNumberInRotateArray(int[] array) {
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```java
private int[][] next = {{0, -1}, {0, 1}, {-1, 0}, {1, 0}};
public boolean hasPath(char[] matrix, int rows, int cols, char[] str) {
if (rows == 0 || cols == 0) return false;
public boolean hasPath(char[] matrix, int rows, int cols, char[] str){
if(rows == 0 || cols == 0) return false;
char[][] m = new char[rows][cols];
for (int i = 0, idx = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
for(int i = 0, idx = 0; i < rows; i++) {
for(int j = 0; j < cols; j++) {
m[i][j] = matrix[idx++];
}
}
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
if (backtracking(m, rows, cols, str, new boolean[rows][cols], 0, i, j)) return true;
for(int i = 0; i < rows; i++) {
for(int j = 0; j < cols; j ++) {
if(backtracking(m, rows, cols, str, new boolean[rows][cols], 0, i, j)) return true;
}
}
return false;
}
private boolean backtracking(char[][] m, int rows, int cols, char[] str, boolean[][] used, int path, int r, int c) {
if (path == str.length) return true;
if (r < 0 || r >= rows || c < 0 || c >= cols) return false;
if (m[r][c] != str[path]) return false;
if (used[r][c]) return false;
if(path == str.length) return true;
if(r < 0 || r >= rows || c < 0 || c >= cols) return false;
if(m[r][c] != str[path]) return false;
if(used[r][c]) return false;
used[r][c] = true;
for (int i = 0; i < next.length; i++) {
if (backtracking(m, rows, cols, str, used, path + 1, r + next[i][0], c + next[i][1])) return true;
for(int i = 0; i < next.length; i++) {
if(backtracking(m, rows, cols, str, used, path + 1, r + next[i][0], c + next[i][1])) return true;
}
used[r][c] = false;
return false;