Compilare: main.cpp: In function 'int main()': main.cpp:24:42: warning: array subscript has type 'char' [-Wchar-subscripts] orig = orig * 64 % MOD + cod[a[i]] % MOD; ^ main.cpp:25:40: warning: array subscript has type 'char' [-Wchar-subscripts] cur = cur * 64 % MOD + cod[b[i]] % MOD; ^ main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = n; i < b.size(); ++i) { ~~^~~~~~~~~~ main.cpp:30:35: warning: array subscript has type 'char' [-Wchar-subscripts] cur = ((cur - cod[b[i - n]] * pw % MOD + MOD) * 64 + cod[b[i]]) % MOD; ^ main.cpp:30:70: warning: array subscript has type 'char' [-Wchar-subscripts] cur = ((cur - cod[b[i - n]] * pw % MOD + MOD) * 64 + cod[b[i]]) % MOD; ^ main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pos.size(); ++i) ~~^~~~~~~~~~~~