Compilare: main.cpp: In function 'void solve()': main.cpp:47:11: warning: 'void* memset(void*, int, size_t)' clearing an object of type 'class std::vector<int>' with no trivial copy-assignment; use assignment or value-initialization instead [-Wclass-memaccess] 47 | memset(v, 0, sizeof(v)); | ~~~~~~^~~~~~~~~~~~~~~~~ In file included from /usr/include/c++/12.2.1/vector:64, from /usr/include/c++/12.2.1/queue:61, from main.cpp:3: /usr/include/c++/12.2.1/bits/stl_vector.h:423:11: note: 'class std::vector<int>' declared here 423 | class vector : protected _Vector_base<_Tp, _Alloc> | ^~~~~~ main.cpp:66:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int j = 0; j < v[i].size(); j++) | ~~^~~~~~~~~~~~~ main.cpp:61:9: warning: unused variable 'last' [-Wunused-variable] 61 | int last = -1; | ^~~~