Language: C++

#include<stdio.h>
int main{
    int a,i,sum;
    int value[j],cost[k];
    scanf("%d\n",&a);
    for(i=0;i<a;i++){
    scanf("%d",&value[i]);
    }
    for(i=0;i<a;i++){
    scanf("%d",&cost[j]);
    }
    int max,min;
　　 for(i=0;i<a;i++){
     for(j=0; j<a; j++){
      if(value[j]>max)max=value[j];
     }
     for(j=0; j<a; j++){
      if(value[j]==max)value[j]=0;
     }
    　for(k=0; k<a; k++){
      if(cost[k]<min)min=cost[k];
　　　}
     for(k=0; k<a; k++){
      if(cost[k]==min)cost[k]=0;
　　　}
　　　 if(max-min>0)sum = max - min;
    }
    printf("%d",sum);
    return0;
    
}


}

Compiler output:
a.cc:13:1: error: extended character 　 is not valid in an identifier
   13 | 　　 for(i=0;i<a;i++){
      | ^
a.cc:13:1: error: extended character 　 is not valid in an identifier
a.cc:20:5: error: extended character 　 is not valid in an identifier
   20 |     　for(k=0; k<a; k++){
      |     ^
a.cc:22:1: error: extended character 　 is not valid in an identifier
   22 | 　　　}
      | ^
a.cc:22:1: error: extended character 　 is not valid in an identifier
a.cc:22:1: error: extended character 　 is not valid in an identifier
a.cc:25:1: error: extended character 　 is not valid in an identifier
   25 | 　　　}
      | ^
a.cc:25:1: error: extended character 　 is not valid in an identifier
a.cc:25:1: error: extended character 　 is not valid in an identifier
a.cc:26:1: error: extended character 　 is not valid in an identifier
   26 | 　　　 if(max-min>0)sum = max - min;
      | ^
a.cc:26:1: error: extended character 　 is not valid in an identifier
a.cc:26:1: error: extended character 　 is not valid in an identifier
a.cc:2:5: error: cannot declare '::main' to be a global variable
    2 | int main{
      |     ^~~~
a.cc:3:5: error: expected primary-expression before 'int'
    3 |     int a,i,sum;
      |     ^~~
a.cc:3:5: error: expected '}' before 'int'
a.cc:2:9: note: to match this '{'
    2 | int main{
      |         ^
a.cc:4:15: error: 'j' was not declared in this scope
    4 |     int value[j],cost[k];
      |               ^
a.cc:4:23: error: 'k' was not declared in this scope
    4 |     int value[j],cost[k];
      |                       ^
a.cc:5:10: error: expected constructor, destructor, or type conversion before '(' token
    5 |     scanf("%d\n",&a);
      |          ^
a.cc:6:5: error: expected unqualified-id before 'for'
    6 |     for(i=0;i<a;i++){
      |     ^~~
a.cc:6:13: error: 'i' does not name a type
    6 |     for(i=0;i<a;i++){
      |             ^
a.cc:6:17: error: 'i' does not name a type
    6 |     for(i=0;i<a;i++){
      |                 ^
a.cc:9:5: error: expected unqualified-id before 'for'
    9 |     for(i=0;i<a;i++){
      |     ^~~
a.cc:9:13: error: 'i' does not name a type
    9 |     for(i=0;i<a;i++){
      |             ^
a.cc:9:17: error: 'i' does not name a type
    9 |     for(i=0;i<a;i++){
      |                 ^
a.cc:13:1: error: '\U00003000\U00003000' does not name a type
   13 | 　　 for(i=0;i<a;i++){
      | ^~~~
a.cc:13:14: error: 'i' does not name a type
   13 | 　　 for(i=0;i<a;i++){
      |              ^
a.cc:13:18: error: 'i' does not name a type
   13 | 　　 for(i=0;i<a;i++){
      |                  ^
a.cc:28:11: error: expected constructor, destructor, or type conversion before '(' token
   28 |     printf("%d",sum);
      |           ^
a.cc:29:5: error: 'return0' does not name a type
   29 |     return0;
      |     ^~~~~~~
a.cc:31:1: error: expected declaration before '}' token
   31 | }
      | ^
a.cc:34:1: error: expected declaration before '}' token
   34 | }
      | ^