Compilare: main.cpp: In function 'void solve(long long int, int, int)': main.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<lvl[l+1].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<lvl[m].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:77:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j<lvl[i].size(); j++) ~^~~~~~~~~~~~~~ main.cpp:78:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k<lvl[i+1].size(); k++) ~^~~~~~~~~~~~~~~~