Compilare: main.cpp: In function 'int main()': main.cpp:17:19: warning: array subscript has type 'char' [-Wchar-subscripts] 17 | fr[s[i]]++; | ~~~^ main.cpp:20:19: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | fr[t[i]]--; | ~~~^ main.cpp:21:22: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | if(fr[t[i]]==-1) ++k; | ~~~^ main.cpp:12:15: warning: array subscript 150 is above array bounds of 'int [150]' [-Warray-bounds] 12 | fr[150]={0}; | ~~~~~~^ main.cpp:5:5: note: while referencing 'fr' 5 | int fr[150],k; | ^~