Compilare: user.cpp: In function ‘int main()’: user.cpp:19:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&n,&m); ^ user.cpp:24:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&v[i][j]); ^ user.cpp:44:36: warning: ‘coltmp’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i >= lin+1 && j <= col-1 && a[i][j] == 0 && q[v[i][j]] == 0) ^ user.cpp:34:18: warning: ‘lintmp’ may be used uninitialized in this function [-Wmaybe-uninitialized] int nr = n*m,lintmp,coltmp; ^