pragma solidity ^0.5.1;

library ArrayUtils {

    function max(uint[] memory data) internal view returns (uint) {
        uint N = data.length;
        uint retval=0;
        for (uint i=0; i<N; i++) {
            if (data[i] > retval) {
                retval = data[i];
            }
        }
        return retval;
    }

    function sum(uint[] memory data) internal view returns (uint) {
        uint N = data.length;
        uint s = 0;
        for (uint i=0; i<N; i++) {
            s = s + data[i];
        }
        return s;
    }

    function max_index(uint[] memory data) internal view returns (uint) {
        uint N = data.length;
        uint retval=0;
        uint retindex=0;
        for (uint i=0; i<N; i++) {
            if (data[i] > retval) {
                retval = data[i];
                retindex = i;
            }
        }
        return retindex;
    }
}