Compilare: user.cpp: In function ‘int main()’: user.cpp:75:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:79:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &M[i][j]); ^ user.cpp:108:19: warning: ‘mj’ may be used uninitialized in this function [-Wmaybe-uninitialized] print_sol(mi,mj); ^ user.cpp:108:19: warning: ‘mi’ may be used uninitialized in this function [-Wmaybe-uninitialized]