Compilare: main.cpp: In function 'int main()': main.cpp:55:63: warning: array subscript has type 'char' [-Wchar-subscripts] 55 | hash_a1 = ((long long)P1 * hash_a1 % MOD1 + value[a[i]]) % MOD1; | ^ main.cpp:56:63: warning: array subscript has type 'char' [-Wchar-subscripts] 56 | hash_a2 = ((long long)P2 * hash_a2 % MOD2 + value[a[i]]) % MOD2; | ^ main.cpp:65:63: warning: array subscript has type 'char' [-Wchar-subscripts] 65 | hash_b1 = ((long long)P1 * hash_b1 % MOD1 + value[b[i]]) % MOD1; | ^ main.cpp:66:63: warning: array subscript has type 'char' [-Wchar-subscripts] 66 | hash_b2 = ((long long)P2 * hash_b2 % MOD2 + value[b[i]]) % MOD2; | ^ main.cpp:78:66: warning: array subscript has type 'char' [-Wchar-subscripts] 78 | hash_b1 = ((long long)hash_b1 - (long long)value[b[i - N]] * p1 % MOD1 + MOD1) % MOD1; | ^ main.cpp:79:66: warning: array subscript has type 'char' [-Wchar-subscripts] 79 | hash_b2 = ((long long)hash_b2 - (long long)value[b[i - N]] * p2 % MOD2 + MOD2) % MOD2; | ^ main.cpp:81:63: warning: array subscript has type 'char' [-Wchar-subscripts] 81 | hash_b1 = ((long long)hash_b1 * P1 % MOD1 + value[b[i]]) % MOD1; | ^ main.cpp:82:63: warning: array subscript has type 'char' [-Wchar-subscripts] 82 | hash_b2 = ((long long)hash_b2 * P2 % MOD2 + value[b[i]]) % MOD2; | ^ main.cpp:92:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | for(int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~