added a code to solve Rotting Oranges problem

Author: manthansubhash01

Python/Rotting Oranges.py

@@ -0,0 +1,27 @@
+def orangesRotting(grid):
+    n,m = len(grid),len(grid[0])
+
+    move = [[1,0],[-1,0],[0,1],[0,-1]]
+    time = -1
+    q = []
+
+    for i in range(n):
+        for j in range(m):
+            if grid[i][j] == 2:
+                q.append([i,j,0])
+    
+    while q:
+        a = q.pop(0)
+        time = a[2]
+
+        for direc in move:
+            x,y = a[0]+direc[0],a[1]+direc[1]
+            if 0 <= x < n and 0 <= y < m and grid[x][y] == 1:
+                q.append([x,y,a[2]+1])
+                grid[x][y] = 2
+    
+    for i in range(n):
+        for j in range(m):
+            if grid[i][j] == 1:
+                return -1
+    return time