Compilare: main.cpp: In function 'int main()': main.cpp:41:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1 ; i <= s2.size() ; ++ i ) { ~~^~~~~~~~~~~~ main.cpp:45:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < s1.size() ; ++ i ) { ~~^~~~~~~~~~~ main.cpp:46:79: warning: array subscript has type 'char' [-Wchar-subscripts] hash1 = 1LL * ( hash1 + 1LL * fact1 [ i + 1 ] * ( real_val [ s1 [ i ] ] ) % MOD1 ) % MOD1 ; ^ main.cpp:47:79: warning: array subscript has type 'char' [-Wchar-subscripts] hash2 = 1LL * ( hash2 + 1LL * fact2 [ i + 1 ] * ( real_val [ s1 [ i ] ] ) % MOD2 ) % MOD2 ; ^ main.cpp:51:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < s1.size() ; ++ i ) { ~~^~~~~~~~~~~ main.cpp:52:79: warning: array subscript has type 'char' [-Wchar-subscripts] temp1 = 1LL * ( temp1 + 1LL * fact1 [ i + 1 ] * ( real_val [ s2 [ i ] ] ) % MOD1 ) % MOD1 ; ^ main.cpp:53:79: warning: array subscript has type 'char' [-Wchar-subscripts] temp2 = 1LL * ( temp2 + 1LL * fact2 [ i + 1 ] * ( real_val [ s2 [ i ] ] ) % MOD2 ) % MOD2 ; ^ main.cpp:62:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( ; i < s2.size() ; ++ i ) { ~~^~~~~~~~~~~ main.cpp:63:79: warning: array subscript has type 'char' [-Wchar-subscripts] temp1 = 1LL * ( temp1 + 1LL * fact1 [ i + 1 ] * ( real_val [ s2 [ i ] ] ) % MOD1 ) % MOD1 ; ^ main.cpp:64:79: warning: array subscript has type 'char' [-Wchar-subscripts] temp2 = 1LL * ( temp2 + 1LL * fact2 [ i + 1 ] * ( real_val [ s2 [ i ] ] ) % MOD2 ) % MOD2 ; ^ main.cpp:65:103: warning: array subscript has type 'char' [-Wchar-subscripts] temp1 = 1LL * ( temp1 - 1LL * fact1 [ i + 1 - s1.size() ] * ( real_val [ s2 [ i - s1.size() ] ] ) % MOD1 + MOD1 ) % MOD1 ; ^ main.cpp:66:103: warning: array subscript has type 'char' [-Wchar-subscripts] temp2 = 1LL * ( temp2 - 1LL * fact2 [ i + 1 - s1.size() ] * ( real_val [ s2 [ i - s1.size() ] ] ) % MOD2 + MOD2 ) % MOD2 ; ^ main.cpp:21:25: warning: unused variable 'j' [-Wunused-variable] int i , hash1 = 0 , j , hash2 = 0 ; ^