Compilare: user.cpp: In function ‘void lee(int, int)’: user.cpp:26:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (l1>=1 && l1<=n && c1>=1 && c1<=m && a[l1][c1]!=-1) ^ user.cpp: In function ‘int main()’: user.cpp:45:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.cpp:48:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:54:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^