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    HERE'S A BASIC AND UNDERSTANDABLE APPROACH

    include

    include

    include

    using namespace std;

    int max_of_four(int a, int b, int c, int d) { vector v1 = {a, b, c, d}; // Initialize vector int maxi = v1[0]; // Start with the first element

    for (auto i = v1.begin(); i != v1.end(); i++) {
        if (*i > maxi) { // Compare correctly
            maxi = *i;
        }
    }
    
    return maxi;
    

    }

    int main() { int a, b, c, d; scanf("%d %d %d %d", &a, &b, &c, &d); int ans = max_of_four(a, b, c, d); printf("%d", ans);

    return 0;
    

    }