Compilare: user.cpp: In function ‘int main()’: user.cpp:14:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++){ ^ user.cpp:22:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol>strlen(s)-ok)sol=strlen(s)-ok; ^ user.cpp:11:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",s); ^