foo.cc: In function 'int main()':
foo.cc:9:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |         for(int i=0;i<st.size();i++)
      |                     ~^~~~~~~~~~
foo.cc:12:22: error: invalid types 'int[int]' for array subscript
   12 |                 if(st[i]>='0'&&st[i]<='9'||st[i]>='A'&&st[i]<='F')
      |                      ^
foo.cc:12:34: error: invalid types 'int[int]' for array subscript
   12 |                 if(st[i]>='0'&&st[i]<='9'||st[i]>='A'&&st[i]<='F')
      |                                  ^
foo.cc:12:46: error: invalid types 'int[int]' for array subscript
   12 |                 if(st[i]>='0'&&st[i]<='9'||st[i]>='A'&&st[i]<='F')
      |                                              ^
foo.cc:12:58: error: invalid types 'int[int]' for array subscript
   12 |                 if(st[i]>='0'&&st[i]<='9'||st[i]>='A'&&st[i]<='F')
      |                                                          ^
foo.cc:14:32: error: invalid types 'int[int]' for array subscript
   14 |                         for(;st[end]>='A'&&st[end]<='F';)
      |                                ^
foo.cc:14:46: error: invalid types 'int[int]' for array subscript
   14 |                         for(;st[end]>='A'&&st[end]<='F';)
      |                                              ^
foo.cc:14:25: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   14 |                         for(;st[end]>='A'&&st[end]<='F';)
      |                         ^~~
foo.cc:15:39: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   15 |                                 end++;end--;
      |                                       ^~~
foo.cc:17:38: error: invalid types 'int[int]' for array subscript
   17 |                                 if(st[j]>='0'&&st[j]<='9')
      |                                      ^
foo.cc:17:50: error: invalid types 'int[int]' for array subscript
   17 |                                 if(st[j]>='0'&&st[j]<='9')
      |                                                  ^
foo.cc:18:46: error: invalid types 'int[int]' for array subscript
   18 |                                         s+=st[j]-'0'*pow(16,++t);
      |                                              ^
foo.cc:19:43: error: invalid types 'int[int]' for array subscript
   19 |                                 else if(st[j]>='A'&&st[j]<='F')
      |                                           ^
foo.cc:19:55: error: invalid types 'int[int]' for array subscript
   19 |                                 else if(st[j]>='A'&&st[j]<='F')
      |                                                       ^
foo.cc:20:46: error: invalid types 'int[int]' for array subscript
   20 |                                         s+=st[j]-'A'+10*pow(16,++t);
      |                                              ^
foo.cc:23:39: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   23 |                         else if(s>='A'&&s<='Z'||s>='a'&&s<='z')
      |                                 ~~~~~~^~~~~~~~

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