Compilare: user.cpp: In function ‘int main()’: user.cpp:17:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(a)) { ^ user.cpp:19:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[j]>a[j+1]&&a[j+1]<a[j+2]&&j+2<strlen(a)) { ^ user.cpp:34:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(a)) { ^ user.cpp:13:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%s",&p,a); ^