运行 ID: 31748

Main.cc: In function ‘int main()’:
Main.cc:7:26: error: invalid types ‘size_t(const char*) throw () {aka long unsigned int(const char*) throw ()}[char [100005]]’ for array subscript
     for (int i = strlen[s]; i > 0; -- i){
                          ^
Main.cc:15:17: error: ‘a’ was not declared in this scope
             if (a[i] >= 'A' && a[i] <= 'C'){
                 ^