Compilare: user.cpp: In function ‘void main2()’: user.cpp:101:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d\n",&n,&k); ^ user.cpp:103:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v+1,Q,in); ^ user.cpp: In function ‘int main()’: user.cpp:167:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&test); ^ user.cpp: In function ‘void main2()’: user.cpp:160:54: warning: ‘who’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out,"%d %d\n",t[who].wh,t[who].wh+aux[who]-1); ^