Language: C

#include<stdio.h>
#include<stdlib.h>

int main(void){
    int n;
    char s[4010];
    int sum=0;
    scanf("%d",&n);
    scanf("%s",s);

    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            for(int k=0;k<n;k++){
                //print("i,j,k:{},{},{}".format(i,j,k))
                if(!(i<j&&j<k)){
                    continue;
                }
                if(s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
                    sum+=1;
                    //#print("i,j,k:{},{},{}".format(i,j,k))
                }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
                    sum+=1;
                    //#print("i,j,k:{},{},{}".format(i,j,k))
                }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
                    sum+=1;
                    //#print("i,j,k:{},{},{}".format(i,j,k))
                }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
                    sum+=1;
                    //#print("i,j,k:{},{},{}".format(i,j,k))
                }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
                    sum+=1;
                    //#print("i,j,k:{},{},{}".format(i,j,k))
                }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
                    sum+=1;
                    //#print("i,j,k:{},{},{}".format(i,j,k))
                }
            }
        }
    }
    print(sum);
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:18:24: warning: comparison between pointer and integer
   18 |                 if(s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                        ^~
main.c:18:35: warning: comparison between pointer and integer
   18 |                 if(s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                   ^~
main.c:18:46: warning: comparison between pointer and integer
   18 |                 if(s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                              ^~
main.c:21:31: warning: comparison between pointer and integer
   21 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                               ^~
main.c:21:42: warning: comparison between pointer and integer
   21 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                          ^~
main.c:21:53: warning: comparison between pointer and integer
   21 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                                     ^~
main.c:24:31: warning: comparison between pointer and integer
   24 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                               ^~
main.c:24:42: warning: comparison between pointer and integer
   24 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                          ^~
main.c:24:53: warning: comparison between pointer and integer
   24 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                                     ^~
main.c:27:31: warning: comparison between pointer and integer
   27 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                               ^~
main.c:27:42: warning: comparison between pointer and integer
   27 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                          ^~
main.c:27:53: warning: comparison between pointer and integer
   27 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                                     ^~
main.c:30:31: warning: comparison between pointer and integer
   30 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                               ^~
main.c:30:42: warning: comparison between pointer and integer
   30 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                          ^~
main.c:30:53: warning: comparison between pointer and integer
   30 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                                     ^~
main.c:33:31: warning: comparison between pointer and integer
   33 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                               ^~
main.c:33:42: warning: comparison between pointer and integer
   33 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                          ^~
main.c:33:53: warning: comparison between pointer and integer
   33 |                 }else if (s[i]=="R"&&s[j]=="G"&&s[k]=="B"&&(j-i!=k-j)){
      |                                                     ^~
main.c:40:5: error: implicit declaration of function 'print'; did you mean 'printf'? [-Wimplicit-function-declaration]
   40 |     print(sum);
      |     ^~~~~
      |     printf