Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(rj,"%d""%d",&n,&m); ^ user.cpp:24:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(rj,"%c",&c); ^ user.cpp:27:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(rj,"%c",&c); ^ user.cpp:36:16: warning: ‘r2’ may be used uninitialized in this function [-Wmaybe-uninitialized] a[r1][r2]=1; ^ user.cpp:36:16: warning: ‘r1’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:56:16: warning: ‘j2’ may be used uninitialized in this function [-Wmaybe-uninitialized] b[j1][j2]=1; ^ user.cpp:56:16: warning: ‘j1’ may be used uninitialized in this function [-Wmaybe-uninitialized]