Compilare: user.cpp: In function ‘int main()’: user.cpp:75:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &N, &K ); ^ user.cpp:92:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &V[i][j] ); ^ user.cpp:150:20: warning: ‘retMask’ may be used uninitialized in this function [-Wmaybe-uninitialized] if ( (retMask>>i) & 1 ) ^