upd

algorithms/labs/lab8/code/greedy/1.py

@@ -0,0 +1,12 @@
+def max_profit(prices):
+    profit = 0
+    for i in range(1, len(prices)):
+        if prices[i] > prices[i - 1]:
+            profit += prices[i] - prices[i - 1]
+    return profit
+
+
+if __name__ == "__main__":
+    print(max_profit([7, 1, 5, 3, 6, 4]))
+    print(max_profit([1, 2, 3, 4, 5]))
+    print(max_profit([7, 6, 4, 3, 1]))

algorithms/labs/lab8/code/greedy/2.py

@@ -0,0 +1,16 @@
+def can_complete_circuit(gas, cost):
+    if sum(gas) < sum(cost):
+        return -1
+    start = 0
+    bal = 0
+    for i in range(len(gas)):
+        bal += gas[i] - cost[i]
+        if bal < 0:
+            start = i + 1
+            bal = 0
+    return start
+
+
+if __name__ == "__main__":
+    print(can_complete_circuit([1, 2, 3, 4, 5], [3, 4, 5, 1, 2]))
+    print(can_complete_circuit([2, 3, 4], [3, 4, 3]))

algorithms/labs/lab8/code/greedy/3.py

@@ -0,0 +1,22 @@
+from functools import cmp_to_key
+
+
+def largest_number(nums):
+    arr = list(map(str, nums))
+
+    def cmp(a, b):
+        if a + b < b + a:
+            return 1
+        if a + b > b + a:
+            return -1
+        return 0
+
+    arr.sort(key=cmp_to_key(cmp))
+    res = "".join(arr)
+    return "0" if res[0] == "0" else res
+
+
+if __name__ == "__main__":
+    print(largest_number([10, 2]))
+    print(largest_number([3, 30, 34, 5, 9]))
+    print(largest_number([0, 0]))