Compilare: user.cpp: In function ‘void solve()’: user.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (t < q.size()) ^ user.cpp:67:14: warning: variable ‘ok2’ set but not used [-Wunused-but-set-variable] bool ok2 = false; ^ user.cpp: In function ‘int main()’: user.cpp:131:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:132:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d",&st.x, &st.y, &dr.x, &dr.y); ^ user.cpp:135:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i][j]); ^