Main.c:4:46: error: expected ';', ',' or ')' before '&' token
    4 | int findA(char s[], int left, int right, int &sum) {
      |                                              ^
Main.c: In function 'main':
Main.c:40:2: warning: implicit declaration of function 'findA' [-Wimplicit-function-declaration]
   40 |  findA(s, 0, i, sum);
      |  ^~~~~
Main.c:35:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   35 |   scanf("%c", &s[i]);
      |   ^~~~~~~~~~~~~~~~~~