Compilare: main.cpp: In function 'int invmod(int)': main.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] 24 | } | ^ main.cpp: In function 'int main()': main.cpp:57:37: warning: array subscript has type 'char' [-Wchar-subscripts] 57 | if(i + k <= n) f[s[i + k - 1]]--; | ~~~~~~~~~~~^ main.cpp:39:15: warning: unused variable 'id' [-Wunused-variable] 39 | int n,i,k,id = 0; | ^~