foo.cc: In function 'void dijkstra(int, int)':
foo.cc:45:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
             if(u==a&&e.to==b||u==b&&e.to==a)continue;//是个无向图 
                    ^
foo.cc: In function 'int main()':
foo.cc:58:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^
foo.cc:59:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=n;i++)scanf("%d%d",&x[i],&y[i]);
                                                   ^
foo.cc:61:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&from,&to);
                                ^

自豪的采用 HydroJudger 进行评测(github.com/hydro-dev/HydroJudger)

{"receive":"2020-05-13T13:17:30.969Z","handle":"2020-05-13T13:17:30.969Z","cache_start":"2020-05-13T13:17:30.977Z","read_cases":"2020-05-13T13:17:31.098Z","judge":"2020-05-13T13:17:31.129Z","done":"2020-05-13T13:17:31.520Z"}