Vector's range error

#include <iostream>
#include <vector>
using namespace std;
 
bool isSafe(vector < vector < int>>& matrix, int x, int y, vector < vector < bool>>& visited) {
    int rows = matrix.size();
    int cols = matrix[0].size();
    return (x >= 0 && x < rows && y >= 0 && y < cols && matrix[x][y] == 1 && !visited[x][y]);
}
 
void findLongestPath(vector < vector < int>>& matrix, int x, int y, int& maxDist, int dist, vector < vector < bool>>& visited) {
    int rows = matrix.size();
    int cols = matrix[0].size();
    if (x == rows - 1 && y == cols - 1) {
        maxDist = max(maxDist, dist);
        return;
    }
    visited[x][y] = true;
    if (isSafe(matrix, x + 1, y, visited)) {
        findLongestPath(matrix, x + 1, y, maxDist, dist + 1, visited);
    }
    if (isSafe(matrix, x, y - 1, visited)) {
        findLongestPath(matrix, x, y - 1, maxDist, dist + 1, visited);
    }
    visited[x][y] = false;
}
 
int main() {
    setlocale(0, "rus");
    int r, c,t,b,rb,cb;
    cin >> t>>r >>c>>b;
 
    vector < vector < int>>matrix(r, vector<int>(c, 0));
    for (int i = 0; i < b; i++) {
        cin >> rb >> cb;
        matrix[rb][cb] = 1;
    }
 
    vector < vector < bool>> visited(r, vector<bool>(c, false));
 
    int maxDist = 0;
    findLongestPath(matrix, 0, 0, maxDist, 0, visited);
 
    cout << "Самая длинная дорога до правого нижнего края матрицы: " << maxDist << endl;
 
    return 0;
}