Compilare: user.cpp: In function ‘void solve(int, int, int)’: user.cpp:89:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = st; j < qid.size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:132:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &L, &q); ^ user.cpp:135:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &S[i].u, &S[i].v, &S[i].c, &S[i].r); ^ user.cpp:140:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &Q[i].u, &Q[i].v, &Q[i].a, &Q[i].b); ^