Compilare: main.cpp: In function 'void insertHash(int)': main.cpp:20:22: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 20 | if (it.first == k) { | ~~~~~~~~~^~~~ main.cpp: In function 'void eraseHash(int)': main.cpp:36:35: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 36 | if (hashMap[key][i].first == k && hashMap[key][i].second == 1) { main.cpp:41:40: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 41 | else if (hashMap[key][i].first == k && hashMap[key][i].second > 1) { main.cpp: In function 'bool searchHash(int)': main.cpp:54:22: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 54 | if (it.first == k && it.second == 1) { | ~~~~~~~~~^~~~ main.cpp: In function 'long long int twoPointers(int)': main.cpp:73:19: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 73 | while (sz > i && st <= dr) { | ~~~^~~ In file included from /usr/include/c++/12.2.1/vector:64, from main.cpp:2: In member function 'constexpr void std::vector<_Tp, _Alloc>::clear() [with _Tp = std::pair<unsigned int, int>; _Alloc = std::allocator<std::pair<unsigned int, int> >]', inlined from 'long long int twoPointers(int)' at main.cpp:87:25: /usr/include/c++/12.2.1/bits/stl_vector.h:1601:24: warning: iteration 666013 invokes undefined behavior [-Waggressive-loop-optimizations] 1601 | { _M_erase_at_end(this->_M_impl._M_start); } | ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'long long int twoPointers(int)': main.cpp:86:23: note: within this loop 86 | for (int i = 0; i <= MOD; ++i) { | ^