Compilare: user.cpp: In function ‘int main()’: user.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < strlen(s)){ ^ user.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(n>=strlen(s)) ^ user.cpp:39:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else for(int k=strlen(s)-1; k>=strlen(s)-1-n; --k) ^ user.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < strlen(s)){ ^ user.cpp:43:53: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(!Stiva.empty() and (Stiva.top()=='(' and s[j] == ')' or Stiva.top()=='[' and s[j]==']')) ^ user.cpp:13:15: warning: unused variable ‘p’ [-Wunused-variable] int j, n, p; ^