modifiedBlacklist.sol

pragma solidity ^0.4.18;

contract Blacklist {
   
    struct Reporter {
        address reporterAddress;
        bytes32 latitude;
        bytes32 longitude;
        bytes32 platform;
    }
    
    struct Blacklist {
      bytes32 phoneNum;
      uint totalCount;
      Reporter[] reporters;
    }
    
    mapping (bytes32 => Blacklist) private blacklistInfo;

    function addList(bytes32 number, bytes32 latitude, bytes32 longitude, bytes32 platform) public {
       blacklistInfo[number].phoneNum = number;
       blacklistInfo[number].totalCount += 1;
       blacklistInfo[number].reporters.push(Reporter(msg.sender, latitude, longitude, platform));
    }
    
    function getCount(bytes32 number) view returns (uint)
    {
        return blacklistInfo[number].totalCount;
    }
    
    function getLength(bytes32 number) view returns (uint)
    {
        return blacklistInfo[number].reporters.length;
    }
    
    function getInfo(bytes32 number, uint index) view returns (address reporterAddress, bytes32 latitude, bytes32 longitude, bytes32 platform)
    {
        return (blacklistInfo[number].reporters[index].reporterAddress, 
        blacklistInfo[number].reporters[index].latitude, 
        blacklistInfo[number].reporters[index].longitude, 
        blacklistInfo[number].reporters[index].platform);
    }
    
    function deleteInfo(bytes32 number, uint index)
    {
        // 해당 인덱스의 정보를 모두 0으로 초기화 하지만 배열 길이가 줄어들지는 않음
        delete blacklistInfo[number].reporters[index];
    }
}