Compilare: main.cpp: In function 'int main()': main.cpp:17:30: warning: array subscript has type 'char' [-Wchar-subscripts] for (i=0;i<n;i++) vf[s[i]]++; ^ main.cpp:44:30: warning: array subscript has type 'char' [-Wchar-subscripts] if (j-sf[s[j]]<=r && j+sf[s[j]]<mx) {mx=j+sf[s[j]];nw=j;} ^ main.cpp:44:47: warning: array subscript has type 'char' [-Wchar-subscripts] if (j-sf[s[j]]<=r && j+sf[s[j]]<mx) {mx=j+sf[s[j]];nw=j;} ^ main.cpp:44:66: warning: array subscript has type 'char' [-Wchar-subscripts] if (j-sf[s[j]]<=r && j+sf[s[j]]<mx) {mx=j+sf[s[j]];nw=j;} ^ main.cpp:46:31: warning: array subscript has type 'char' [-Wchar-subscripts] else if (j-sf[s[j]]>r && j+sf[s[j]]<mx) ^ main.cpp:46:47: warning: array subscript has type 'char' [-Wchar-subscripts] else if (j-sf[s[j]]>r && j+sf[s[j]]<mx) ^ main.cpp:47:26: warning: array subscript has type 'char' [-Wchar-subscripts] {mx=j+sf[s[j]];nw=j;} ^ main.cpp:36:24: warning: variable 'nw' set but not used [-Wunused-but-set-variable] int mx,rsp=0,j,w=0,nw; ^~ main.cpp:28:27: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] if (vf[i]!=0) nr--; ^