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traceback.cpp
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traceback.cpp
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#include <iostream>
#include <vector>
#include <string>
using namespace std;
bool hasPathCore(const vector<vector<char>>& matrix, int row, int col,
const string& str, int& pathLength, vector<bool>& visited);
bool hasPath(const vector<vector<char>>& matrix, const string& str) {
int rows = matrix.size();
int cols = matrix[0].size();
if (rows < 1 || cols < 1 || str.empty())
return false;
vector<bool> visited(rows*cols, 0);
int pathLength = 0;
for (int row = 0; row < rows; row++) {
for (int col = 0; col < cols; col++) {
if (hasPathCore(matrix, row, col, str, pathLength, visited))
return true;
}
}
return false;
}
bool hasPathCore(const vector<vector<char>>& matrix, int row, int col,
const string& str, int& pathLength, vector<bool>& visited) {
int rows = matrix.size();
int cols = matrix[0].size();
if(str[pathLength] == '\0')
return true;
bool hasPath = false;
if (row >= 0 && row < rows && col >= 0 && col < cols && matrix[row][col] == str[pathLength] && !visited[row * cols + col]) {
pathLength++;
visited[row * cols + col] = true;
hasPath = hasPathCore(matrix, row, col - 1, str, pathLength, visited)
|| hasPathCore(matrix, row - 1, col, str, pathLength, visited)
|| hasPathCore(matrix, row, col + 1, str, pathLength, visited)
|| hasPathCore(matrix, row + 1, col, str, pathLength, visited);
if (!hasPath) {
pathLength--;
visited[row * cols + col] = false;
}
}
return hasPath;
}
int main() {
vector<vector<char>> matrix;
vector<char> row1 = {'a', 'b', 't', 'g'};
vector<char> row2 = {'c', 'f', 'c', 's'};
vector<char> row3 = {'j', 'd', 'e', 'h'};
matrix.push_back(row1);
matrix.push_back(row2);
matrix.push_back(row3);
string str = "bfce";
bool found = hasPath(matrix, str);
if (found)
cout << "Found !" << endl;
return 0;
}