Compilare: user.cpp: In function ‘int main()’: user.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<strlen(s);j++){ ^ user.cpp:65:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&m,&k); ^ user.cpp:67:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",s); ^