Compilare: user.cpp: In function ‘int main()’: user.cpp:54:66: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%lld%d%d%d%d%d%d",&n,&m,&c,&r,&x,&y,&z,&w,&u); ^ user.cpp:57:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&mat[1][j]); ^ user.cpp:61:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&mat[i][1]); ^