You are given a String[] photo containing a photograph of some bacteria. The bacteria lie in a rectangular grid, and the jth character of the ith element of photo represents the content of the cell at row i, column j of the grid. The '.' character represents empty space and the '*' character represents a part of a bacterium.
Two nonempty cells a and b belong to the same bacterium if and only if there exists a chain of cells where the first cell is a, the last cell is b, and each pair of consecutive cells in the chain shares a common side.
You are studying a special kind of bacteria called tristripe bacteria. They have a special property: a tristripe bacterium can be formed by exactly three stripes (horizontal or vertical) that possibly intersect and/or overlap. All four bacteria in the picture below are tristripe:
{"........................***...",
"......*........*.........***..",
"...******..................***",
"......*.............*.........",
".....**.........******........",
".............................."}
Return the number of tristripes in the photo.
