Main.cc: In function ‘void k(int, int)’: Main.cc:6:16: error: ‘o’ was not declared in this scope if(b[p]==b[o]){ ^ Main.cc: In function ‘int main()’: Main.cc:17:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int o=1;o<=strlen(a);o+=2){ ~^~~~~~~~~~~ Main.cc:23:11: error: expected primary-expression before ‘]’ token k[]; ^ Main.cc:29:1: error: expected ‘}’ at end of input } ^