Language: C++

#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <string>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
typedef long long ll;

using namespace std;


int inputValue(){
    int a;
    cin >> a;
    return a;
};

void inputArray(int * p, int a){
    rep(i, a){
        cin >> p[i];
    }
};

void inputVector(vector<int> * p, int a){
    rep(i, a){
        int input;
        cin >> input;
        p -> push_back(input);
    }
}

template <typename T>
void output(T a, int precision) {
    if(precision > 0){
        cout << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

int main(int argc, const char * argv[]) {
    
    // source code
    int a,b;
    cin >> a >> b ;
    int max;
    max = a + b;
    if (max<a - b)
        max = a - b;
    if (max<a * b)
        max = a * b;
    cout << max << endl;
    return 0;
}#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <string>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
typedef long long ll;

using namespace std;


int inputValue(){
    int a;
    cin >> a;
    return a;
};

void inputArray(int * p, int a){
    rep(i, a){
        cin >> p[i];
    }
};

void inputVector(vector<int> * p, int a){
    rep(i, a){
        int input;
        cin >> input;
        p -> push_back(input);
    }
}

template <typename T>
void output(T a, int precision) {
    if(precision > 0){
        cout << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

int main(int argc, const char * argv[]) {
    
    // source code
    int a,b;
    cin >> a >> b ;
    int max;
    max = a + b;
    if (max<a - b)
        max = a - b;
    if (max<a * b)
        max = a * b;
    cout << max << endl;
    return 0;
}

Compiler output:
a.cc:62:2: error: stray '#' in program
   62 | }#include <iostream>
      |  ^
a.cc:62:3: error: 'include' does not name a type
   62 | }#include <iostream>
      |   ^~~~~~~
a.cc:80:5: error: redefinition of 'int inputValue()'
   80 | int inputValue(){
      |     ^~~~~~~~~~
a.cc:19:5: note: 'int inputValue()' previously defined here
   19 | int inputValue(){
      |     ^~~~~~~~~~
a.cc:86:6: error: redefinition of 'void inputArray(int*, int)'
   86 | void inputArray(int * p, int a){
      |      ^~~~~~~~~~
a.cc:25:6: note: 'void inputArray(int*, int)' previously defined here
   25 | void inputArray(int * p, int a){
      |      ^~~~~~~~~~
a.cc:92:6: error: redefinition of 'void inputVector(std::vector<int>*, int)'
   92 | void inputVector(vector<int> * p, int a){
      |      ^~~~~~~~~~~
a.cc:31:6: note: 'void inputVector(std::vector<int>*, int)' previously defined here
   31 | void inputVector(vector<int> * p, int a){
      |      ^~~~~~~~~~~
a.cc:101:6: error: redefinition of 'template<class T> void output(T, int)'
  101 | void output(T a, int precision) {
      |      ^~~~~~
a.cc:40:6: note: 'template<class T> void output(T, int)' previously declared here
   40 | void output(T a, int precision) {
      |      ^~~~~~
a.cc:110:5: error: redefinition of 'int main(int, const char**)'
  110 | int main(int argc, const char * argv[]) {
      |     ^~~~
a.cc:49:5: note: 'int main(int, const char**)' previously defined here
   49 | int main(int argc, const char * argv[]) {
      |     ^~~~