The problem dCoders solves

Prevents ranklist manipulations and question manipulations and removes ownership.Automatic prize distribution of the collected pool of ether from participants to the winners.

Challenges we ran into

Ran out of gas a lot of times during deployment and migration of smart contract. The issue was with ganache, in which around 10 times gas was being used while deployment compared to rinkeby test network due to the continuously developing environment of ganache, so we shifted to rinkeby test network. The deployment was tough, working with lite-server, ganache etc. Also solidity web contracts had to be changed a lot of times in terms of syntax due to drastic changes in the new solidity 0.5 version.