Compilare: user.cpp: In function ‘void read()’: user.cpp:24:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[100005]’ [-Wformat=] scanf("%d \n%s",&P,&s); ^ user.cpp: In function ‘void solve1()’: user.cpp:35:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f[s[i]]==0) ^ user.cpp:37:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[i]]=1; ^ user.cpp: In function ‘void read()’: user.cpp:22:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.in","r",stdin); ^ user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.out","w",stdout); ^ user.cpp:24:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d \n%s",&P,&s); ^