foo.cpp: In function 'int main()':
foo.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<g[i].size();j++)
                 ~^~~~~~~~~~~~
foo.cpp:58:30: error: 'eps' was not declared in this scope
   printf("%.1lf\n",a[1][n+1]+eps);
                              ^~~