foo.cpp: In function 'bool check(long int, long int, long int)':
foo.cpp:13:17: error: 'ture' was not declared in this scope
  if(s<=m)return ture;
                 ^
foo.cpp: In function 'int main()':
foo.cpp:24:1: error: 'MID' was not declared in this scope
 MID=(L+R)/2;
 ^
foo.cpp:17:18: warning: unused variable 'MTD' [-Wunused-variable]
 long l,m,n,i,L,R,MTD;
                  ^
foo.cpp: In function 'bool check(long int, long int, long int)':
foo.cpp:15:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^