foo.cpp: In function 'void sear_ch(int, int)':
foo.cpp:86:23: error: 'i' was not declared in this scope
         sear_ch(used, i + 1);
                       ^
foo.cpp: At global scope:
foo.cpp:88:5: error: expected unqualified-id before 'for'
     for (int i = 1; i <= 100; i++)
     ^
foo.cpp:88:21: error: 'i' does not name a type
     for (int i = 1; i <= 100; i++)
                     ^
foo.cpp:88:31: error: 'i' does not name a type
     for (int i = 1; i <= 100; i++)
                               ^
foo.cpp:90:1: error: expected declaration before '}' token
 }
 ^