Compilare: user.cpp: In function ‘void Gen_Sieve()’: user.cpp:30:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<found[i].pos.size();k++) ^ user.cpp:31:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0;l<found[j].pos.size();l++) ^ user.cpp: In function ‘bool Is_In_Hash(int, short int)’: user.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Hash[S].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:88:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G2.size();i++) ^ user.cpp:69:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d\n",&T); ^ user.cpp:73:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&N); ^ user.cpp:81:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&X); ^