Compilare: main.cpp: In function 'int main()': main.cpp:33:89: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri2.in","r",stdin),freopen("drumuri2.out","w",stdout),scanf("%d%d",&n,&m); ^ main.cpp:33:89: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:33:89: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:35:63: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),A(u,w,2*i+1,2*j),u->c=n,u->f=w->c=w->f=0; ^