main.cpp

#include <algorithm>
#include <numeric>
#include <iterator>

int findWinner( float c[30][5] )
{
    float maxes[30];
    for ( int i = 0; i < 30 ; i++ ) {
        auto minmax = std::minmax_element(
            std::begin(c[i]),
            std::end(c[i])
        );
        maxes[i] = std::accumulate(
            std::begin(c[i]),
            std::end(c[i]),
            0
        ) - *minmax.first - *minmax.second;
    }
    return std::distance(
        std::begin(maxes),
        std::max_element(
            std::begin(maxes),
            std::end(maxes),
            [](int a, int b){return a < b;}
        )
        
    );
}