Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:16: warning: unused variable ‘s’ [-Wunused-variable] int maxi=0,s=0,l,i; ^ user.cpp: In function ‘void ans(int)’: user.cpp:49:16: warning: unused variable ‘s’ [-Wunused-variable] int maxi=0,s=0,l,i; ^ user.cpp: In function ‘int main()’: user.cpp:67:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sediu.in","r",stdin); ^ user.cpp:68:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sediu.out","w",stdout); ^ user.cpp:70:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:73:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^