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- number_of_petrol_stations = int(input()) # Number of petrol stations on the track
- indexes = [] # Possible valid indexes
- dict = {} # Keeping the values for later checking
- for i in range(0, number_of_petrol_stations):
- petrol_fuel, kilometers = [int(num) for num in input().split(" ")]
- dict[i] = {}
- dict[i][petrol_fuel] = kilometers # Adding to the dictionary the current values fuel and kilometers
- if petrol_fuel > kilometers:
- indexes.append(i) # if you could start from this station, append it to the list for possible starting point
- for index in indexes:
- current_dict = dict.copy() # Making a current dictionary copy which we can change
- left_out_fuel = list(dict[index].keys())[0] - list(dict[index].values())[0] # Calculating how much more fuel we have in the tank
- del current_dict[index]
- xedni = index
- this_is_the_index = True
- while len(current_dict) > 0: # With this cycle we move through all the stations
- xedni += 1
- if xedni not in current_dict.keys():
- xedni = 0
- current_fuel = list(current_dict[xedni].keys())[0]
- current_kilometeres = list(current_dict[xedni].values())[0]
- current_left_out_fuel = current_fuel - current_kilometeres
- if left_out_fuel + current_left_out_fuel < 0: # If we subtract the current needed fuel from the fuel we have and we have a negative number, we stop the cycle and continue with the next number
- this_is_the_index = False
- break
- left_out_fuel += current_left_out_fuel
- del current_dict[xedni]
- if this_is_the_index: # If we haven't stopped the cycle, this means that the current number is eligible to be a starting point, and the first one gets printed and the program stops
- print(index)
- break
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