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SearchA2DMatrix.java
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SearchA2DMatrix.java
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public class Solution {
public boolean searchMatrix(int[][] matrix, int target) {
int low = 0;
int high = matrix.length - 1;
int row = -1;
while (low <= high) {
int mid = (low + high) / 2;
if (matrix[mid][0] == target) {
return true;
}
if ((mid == matrix.length - 1 || matrix[mid+1][0] > target) && matrix[mid][0] < target) {
row = mid;
break;
}
if (matrix[mid][0] > target) {
high = mid - 1;
} else {
low = mid + 1;
}
}
if (row == -1) {
return false;
}
low = 0;
high = matrix[row].length - 1;
while (low <= high) {
int mid = (low + high) / 2;
if (matrix[row][mid] == target) {
return true;
}
if (matrix[row][mid] > target) {
high = mid - 1;
} else {
low = mid + 1;
}
}
return false;
}
}