Compilare: user.c: In function ‘decomp’: user.c:34:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( isDigit[s[pos]] ) ^ user.c: In function ‘main’: user.c:65:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( isDigit[t] ) { ^ user.c:70:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] } while ( isDigit[t] ); ^ user.c:73:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] } else if ( isLetter[t] ) ^ user.c:82:5: warning: implicit declaration of function ‘sqrt’ [-Wimplicit-function-declaration] n = sqrt( n ); ^ user.c:82:9: warning: incompatible implicit declaration of built-in function ‘sqrt’ [enabled by default] n = sqrt( n ); ^ user.c:58:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread( s, 1, MAX_N * MAX_N + 1, fin ); ^