Compilare: user.cpp: In function ‘long long int countPaths(int, long long int)’: user.cpp:31:17: warning: unused variable ‘i’ [-Wunused-variable] int p, pos, i, l, r, m; ^ user.cpp: In function ‘int main()’: user.cpp:77:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j < A[i].size(); j++) { ^ user.cpp: In function ‘long long int countPaths(int, long long int)’: user.cpp:46:31: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(pos > 0) ans = A[p][pos-1].sum - 1LL * pos * V[A[p][pos].node]; ^