foo.cc:6:1: error: expected initializer before 'struct'
    6 | struct node{
      | ^~~~~~
foo.cc:8:2: error: 'a' does not name a type
    8 | }a[MN];
      |  ^
foo.cc:9:10: error: 'node' was not declared in this scope
    9 | bool cmp(node a,node b){
      |          ^~~~
foo.cc:9:17: error: 'node' was not declared in this scope
    9 | bool cmp(node a,node b){
      |                 ^~~~
foo.cc:9:23: error: expression list treated as compound expression in initializer [-fpermissive]
    9 | bool cmp(node a,node b){
      |                       ^
foo.cc: In function 'void solve()':
foo.cc:13:9: error: 's' was not declared in this scope
   13 |         s=0;
      |         ^
foo.cc:16:22: error: 'a' was not declared in this scope
   16 |                 cin>>a[i].start>>a[i].end>>a[i].time;
      |                      ^
foo.cc:18:14: error: 'a' was not declared in this scope
   18 |         sort(a+1,a+n+1,cmp);
      |              ^
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