foo.cc: In function 'bool spfa()':
foo.cc:27:13: error: expected primary-expression before ';' token
   27 |   for(int i=; i<=n; ++i) d[i]=inf;
      |             ^
foo.cc:28:12: error: expected primary-expression before ',' token
   28 |   memset(v,,sizeof(v));
      |            ^
foo.cc:29:9: error: expected primary-expression before ',' token
   29 |   int l=,r=,x,y;
      |         ^
foo.cc:30:5: error: expected primary-expression before ']' token
   30 |   q[]=s;
      |     ^
foo.cc:31:8: error: expected primary-expression before ';' token
   31 |   d[s]=;
      |        ^
foo.cc:32:8: error: expected primary-expression before ';' token
   32 |   c[s]=;
      |        ^
foo.cc:33:12: error: 'r' was not declared in this scope
   33 |   while(l!=r)
      |            ^
foo.cc:35:5: error: 'x' was not declared in this scope
   35 |     x=q[++l];
      |     ^
foo.cc:36:18: error: expected primary-expression before ';' token
   36 |     if(l==MAXN)l=;
      |                  ^
foo.cc:37:10: error: expected primary-expression before ';' token
   37 |     v[x]=;
      |          ^
foo.cc:39:24: error: 'y' was not declared in this scope
   39 |       if(d[x]+e[i].w<d[y=e[i].go]&&c[x]+e[i].c<=k)
      |                        ^
foo.cc:45:16: error: expected primary-expression before ';' token
   45 |           v[y]=;
      |                ^
foo.cc:47:24: error: expected primary-expression before ';' token
   47 |           if(r==MAXN)r=;
      |                        ^
foo.cc: In function 'int main()':
foo.cc:59:13: error: expected primary-expression before ';' token
   59 |   for(int i=; i<=m; ++i)
      |             ^
foo.cc:68:3: error: return-statement with no value, in function returning 'int' [-fpermissive]
   68 |   return ;
      |   ^~~~~~
foo.cc:55:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   55 |   freopen("input.txt","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
foo.cc:56:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   56 |   freopen("output.txt","w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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