Compilare: main.cpp: In function 'void sol(char*)': main.cpp:8:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ~^~~~~~~~~~ main.cpp:9:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i!=0&&i<strlen(s)-1&&s[i-1]==s[i+1]){strcpy(s+i-1,s+i+2);ok=1;} ~^~~~~~~~~~~~