Compilare: main.cpp: In function 'std::vector<long long int> dfs_up_to(ll)': main.cpp:59:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll i = 1; i < tmp.size(); i++) ~~^~~~~~~~~~~~ main.cpp:63:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] up_to_init[current] = (l - input_val[current] < value.size() ? value[l - input_val[current]] : 0); ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:65:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] up_to_final[current] = (l - output_val[current] < value.size() ? value[l - output_val[current]] : 0); ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:67:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(value.size() == l + 1 - input_val[current]) ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l + 1 - input_val[current] < value.size()) ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:107:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(tmp2.size() <= l) ~~~~~~~~~~~~^~~~