Compilare: user.cpp: In function ‘void solve()’: user.cpp:60:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<st.size(); i++) ^ user.cpp:63:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<dr.size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:18:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:22:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:26:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^