Try this One:- python3-

from sys import stdin from heapq import heappush, heappop

heap = [] # Min-heap item_lookup = set() # Set to track valid elements

def push(v): heappush(heap, v) item_lookup.add(v)

def discard(v): item_lookup.discard(v)

def print_min(): # Remove elements from heap that are no longer valid while heap[0] not in item_lookup: heappop(heap)

print(heap[0])

cmds = { 1: push, 2: discard, 3: print_min }

n = int(stdin.readline()) for _ in range(n): data = list(map(int, stdin.readline().split(" "))) cmdsdata[0]