Given a tank with capacity C liters which is completely filled in starting. Everyday tank is filled with l liters of water and in the case of overflow extra water is thrown out. Now on i-th day i liters of water is taken out for drinking. We need to find out the day at which tank will become empty the first time.
Input : Capacity = 5 l = 2 Output : 4 At the start of 1st day, water in tank = 5 and at the end of the 1st day = (5 - 1) = 4 At the start of 2nd day, water in tank = 4 + 2 = 6 but tank capacity is 5 so water = 5 and at the end of the 2nd day = (5 - 2) = 3 At the start of 3rd day, water in tank = 3 + 2 = 5 and at the end of the 3rd day = (5 - 3) = 2 At the start of 4th day, water in tank = 2 + 2 = 4 and at the end of the 4th day = (4 - 4) = 0 So final answer will be 4