Compilare: main.cpp: In function 'int main()': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(b)-1;i++) ~^~~~~~~~~~~~ main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=k;i<strlen(a)-1;i++){ ~^~~~~~~~~~~~ main.cpp:14:25: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(a,10000005,in); ^