Compilare: user.cpp: In function ‘int main()’: user.cpp:61:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&n,&m); ^ user.cpp:63:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(tmp,4,in); ^ user.cpp:67:30: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v[i],NMAX+3,in); ^ user.cpp:147:13: warning: ‘sum’ may be used uninitialized in this function [-Wmaybe-uninitialized] sum += 2; ^ user.cpp:146:12: warning: ‘xmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] xmin ++; ^