Compilare: user.cpp: In function ‘int main()’: user.cpp:16:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] frecv[ch]++; ^ user.cpp:17:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(frecv[ch]==1) ^ user.cpp:27:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(--frecv[x[begin++]]); ^ user.cpp:8:41: warning: unused variable ‘d’ [-Wunused-variable] int i,S=0,max=0,Z,C,begin=1,start=1,d,distincte=0; ^ user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teatru.in","r",stdin); ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teatru.out","w",stdout); ^ user.cpp:10:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&Z,&C); ^ user.cpp:11:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&ch); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&ch);x[i]=ch; ^