Language: C++

#include<bits/stdc++.h>
using namespace std;

///Author:Refat(BSMRSTU)///

#define ll long long
#define ull unsigned long long
#define ff first
#define ss second
#define pb push_back
#define vi vector<int>
#define pii pair<int,int>
#define pil pair<int,ll>
const int N = 1e#include<bits/stdc++.h>
using namespace std;

///Author:Refat(BSMRSTU)///

#define ll long long
#define ull unsigned long long
#define ff first
#define ss second
#define pb push_back
#define vi vector<int>
#define pii pair<int,int>
#define pil pair<int,ll>
const int N = 1e5 + 5;
const int M = 1e9 + 7;
const double pi=2*acos(0.0);
const double esp=1e-9;
int Set(int N,int pos) {
    return N=N | (1<<pos);
}
int reset(int N,int pos) {
    return N= N & ~(1<<pos);
}
bool check(int N,int pos) {
    return (bool)(N & (1<<pos));
}
int main() {
    /// freopen("input.txt","r",stdin);
    /// freopen("output.txt","w",stdout);
    int test=1;
    ///scanf("%d",&test);
    for(int cs=1; cs<=test; cs++) {
       int n,m;
       scanf("%d %d",&n,&m);
       if((n>=1&&n<=9)&&(m>=1&&m<=9)){
        printf("%d\n",n*m);
       }
       else{
        printf("-1\n");
       }
    }
    return 0;
}

5 + 5;
const int M = 1e9 + 7;
const double pi=2*acos(0.0);
const double esp=1e-9;
int Set(int N,int pos) {
    return N=N | (1<<pos);
}
int reset(int N,int pos) {
    return N= N & ~(1<<pos);
}
bool check(int N,int pos) {
    return (bool)(N & (1<<pos));
}
int main() {
    /// freopen("input.txt","r",stdin);
    /// freopen("output.txt","w",stdout);
    int test=1;
    ///scanf("%d",&test);
    for(int cs=1; cs<=test; cs++) {
       int n,m;
       scanf("%d %d",&n,&m);
       if((n>=1&&m<=9)){
        printf("%d\n",n*m);
       }
       else{
        printf("-1\n");
       }
    }
    return 0;
}



Compiler output:
a.cc:14:15: error: exponent has no digits
   14 | const int N = 1e#include<bits/stdc++.h>
      |               ^~
a.cc:14:17: error: stray '#' in program
   14 | const int N = 1e#include<bits/stdc++.h>
      |                 ^
a.cc:27:11: error: redefinition of 'const int N'
   27 | const int N = 1e5 + 5;
      |           ^
a.cc:14:11: note: 'const int N' previously defined here
   14 | const int N = 1e#include<bits/stdc++.h>
      |           ^
a.cc:58:1: error: expected unqualified-id before numeric constant
   58 | 5 + 5;
      | ^
a.cc:59:11: error: redefinition of 'const int M'
   59 | const int M = 1e9 + 7;
      |           ^
a.cc:28:11: note: 'const int M' previously defined here
   28 | const int M = 1e9 + 7;
      |           ^
a.cc:60:14: error: redefinition of 'const double pi'
   60 | const double pi=2*acos(0.0);
      |              ^~
a.cc:29:14: note: 'const double pi' previously defined here
   29 | const double pi=2*acos(0.0);
      |              ^~
a.cc:61:14: error: redefinition of 'const double esp'
   61 | const double esp=1e-9;
      |              ^~~
a.cc:30:14: note: 'const double esp' previously defined here
   30 | const double esp=1e-9;
      |              ^~~
a.cc:62:5: error: redefinition of 'int Set(int, int)'
   62 | int Set(int N,int pos) {
      |     ^~~
a.cc:31:5: note: 'int Set(int, int)' previously defined here
   31 | int Set(int N,int pos) {
      |     ^~~
a.cc:65:5: error: redefinition of 'int reset(int, int)'
   65 | int reset(int N,int pos) {
      |     ^~~~~
a.cc:34:5: note: 'int reset(int, int)' previously defined here
   34 | int reset(int N,int pos) {
      |     ^~~~~
a.cc:68:6: error: redefinition of 'bool check(int, int)'
   68 | bool check(int N,int pos) {
      |      ^~~~~
a.cc:37:6: note: 'bool check(int, int)' previously defined here
   37 | bool check(int N,int pos) {
      |      ^~~~~
a.cc:71:5: error: redefinition of 'int main()'
   71 | int main() {
      |     ^~~~
a.cc:40:5: note: 'int main()' previously defined here
   40 | int main() {
      |     ^~~~