foo.cc: In function 'void spfa(int)':
foo.cc:33:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 | for (int i=0;i<G[v].size();i++){
      |              ~^~~~~~~~~~~~
foo.cc: At global scope:
foo.cc:70:11: error: redefinition of 'const int MAXN'
   70 | const int MAXN=5010;
      |           ^~~~
foo.cc:7:11: note: 'const int MAXN' previously defined here
    7 | const int MAXN=5010;
      |           ^~~~
foo.cc:72:11: error: redefinition of 'const int INF'
   72 | const int INF=10000000;
      |           ^~~
foo.cc:9:11: note: 'const int INF' previously defined here
    9 | const int INF=10000000;
      |           ^~~
foo.cc:74:8: error: redefinition of 'struct edge'
   74 | struct edge{
      |        ^~~~
foo.cc:11:8: note: previous definition of 'struct edge'
   11 | struct edge{
      |        ^~~~
foo.cc:78:13: error: redefinition of 'std::vector<edge> G [5010]'
   78 | vector<edge>G[MAXN];
      |             ^
foo.cc:15:13: note: 'std::vector<edge> G [5010]' previously declared here
   15 | vector<edge>G[MAXN];
      |             ^
foo.cc:80:5: error: redefinition of 'int d [5010]'
   80 | int d[MAXN],n,m;
      |     ^
foo.cc:17:5: note: 'int d [5010]' previously declared here
   17 | int d[MAXN],n,m;
      |     ^
foo.cc:80:13: error: redefinition of 'int n'
   80 | int d[MAXN],n,m;
      |             ^
foo.cc:17:13: note: 'int n' previously declared here
   17 | int d[MAXN],n,m;
      |             ^
foo.cc:80:15: error: redefinition of 'int m'
   80 | int d[MAXN],n,m;
      |               ^
foo.cc:17:15: note: 'int m' previously declared here
   17 | int d[MAXN],n,m;
      |               ^
foo.cc:82:6: error: redefinition of 'bool exist [5010]'
   82 | bool exist[MAXN];
      |      ^~~~~
foo.cc:19:6: note: 'bool exist [5010]' previously declared here
   19 | bool exist[MAXN];
      |      ^~~~~
foo.cc:84:11: error: redefinition of 'std::queue<int> q'
   84 | queue<int>q;
      |           ^
foo.cc:21:11: note: 'std::queue<int> q' previously declared here
   21 | queue<int>q;
      |           ^
foo.cc:86:6: error: redefinition of 'void spfa(int)'
   86 | void spfa(int s){
      |      ^~~~
foo.cc:23:6: note: 'void spfa(int)' previously defined here
   23 | void spfa(int s){
      |      ^~~~
foo.cc: In function 'void spfa(int)':
foo.cc:96:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 | for (int i=0;i<G[v].size();i++){
      |              ~^~~~~~~~~~~~
foo.cc: At global scope:
foo.cc:108:5: error: redefinition of 'int main()'
  108 | int main(){
      |     ^~~~
foo.cc:45:5: note: 'int main()' previously defined here
   45 | int main(){
      |     ^~~~

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