foo.cc: In function 'int main()':
foo.cc:68:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v.size(); i++) if(abs(v[i]) < mi) mi = abs(v[i]),ans = v[i];
                    ~~^~~~~~~~~~
foo.cc:69:22: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
     printf("%d\n",ans);
                      ^
foo.cc:55:33: warning: 'qq' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int res = (q - c + j) * qq;
                                 ^~
foo.cc:55:22: warning: 'q' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int res = (q - c + j) * qq;
                    ~~^~~

自豪地采用[jd5](https://github.com/masnn/jd5)进行评测