Compilare: main.cpp: In function 'int main()': main.cpp:49:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int j = 0; j < r[x % p].size(); j++) | ~~^~~~~~~~~~~~~~~~~ In function 'int f_hash(int, int, int)', inlined from 'int f_hash(int, int, int)' at main.cpp:10:5, inlined from 'int main()' at main.cpp:39:21: main.cpp:16:23: warning: 'last' may be used uninitialized [-Wmaybe-uninitialized] 16 | long long rez = c * last + d * secondToLast; | ~~^~~~~~ main.cpp: In function 'int main()': main.cpp:28:9: note: 'last' was declared here 28 | int last, secondToLast; | ^~~~