/in/foo.c:3:17: error: expected ']' before ';' token
 #define N 300000;
                 ^
/in/foo.c:9:4: note: in expansion of macro 'N'
 }a[N];
    ^
/in/foo.c:23:24: error: array type has incomplete element type 'struct yuan'
 int result(struct yuan a[], int n){
                        ^
/in/foo.c:23:19: warning: 'struct yuan' declared inside parameter list will not be visible outside of this definition or declaration
 int result(struct yuan a[], int n){
                   ^~~~
/in/foo.c: In function 'result':
/in/foo.c:30:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(j>=n)
   ^~
/in/foo.c:32:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    while(a[i].right >= a[j].right){
    ^~~~~
/in/foo.c:34:35: error: expected ')' before '{' token
     while(a[p].right >= a[j].right{ //这是寻找第一个左端点不同且在a[p]圆外的圆
                                   ^
/in/foo.c:51:3: error: expected expression before '}' token
   }
   ^
/in/foo.c:25:18: warning: unused variable 'o' [-Wunused-variable]
  int i, j, p, k, o;
                  ^
/in/foo.c:25:15: warning: unused variable 'k' [-Wunused-variable]
  int i, j, p, k, o;
               ^
/in/foo.c:25:12: warning: variable 'p' set but not used [-Wunused-but-set-variable]
  int i, j, p, k, o;
            ^
/in/foo.c: In function 'main':
/in/foo.c:3:11: error: expected identifier or '(' before numeric constant
 #define N 300000;
           ^
/in/foo.c:58:6: note: in expansion of macro 'N'
  int N;
      ^
/in/foo.c:60:14: error: lvalue required as unary '&' operand
  scanf("%d", &N);
              ^
/in/foo.c:3:17: error: expected ')' before ';' token
 #define N 300000;
                 ^
/in/foo.c:60:15: note: in expansion of macro 'N'
  scanf("%d", &N);
               ^
/in/foo.c:61:18: error: expected expression before ';' token
  for(int i=0; i<N; i++){
                  ^
/in/foo.c:62:19: error: 'a' undeclared (first use in this function)
   scanf("%d %d", &a[i].in, &a[i].ban);
                   ^
/in/foo.c:62:19: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:3:17: error: expected ')' before ';' token
 #define N 300000;
                 ^
/in/foo.c:66:11: note: in expansion of macro 'N'
  qsort(a, N, sizeof(a[0]), cmp);
           ^
/in/foo.c:66:2: error: too few arguments to function 'qsort'
  qsort(a, N, sizeof(a[0]), cmp);
  ^~~~~
In file included from /in/foo.c:2:0:
/usr/include/stdlib.h:725:13: note: declared here
 extern void qsort (void *__base, size_t __nmemb, size_t __size,
             ^~~~~
/in/foo.c:3:17: error: expected ')' before ';' token
 #define N 300000;
                 ^
/in/foo.c:67:17: note: in expansion of macro 'N'
  re = result(a, N);
                 ^
/in/foo.c:67:14: error: type of formal parameter 1 is incomplete
  re = result(a, N);
              ^