Compilare: main.cpp: In function 'int main()': main.cpp:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s)-2;i++) ~^~~~~~~~~~~~ main.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<strlen(s)-1;j++) ~^~~~~~~~~~~~ main.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=j+1;k<strlen(s);k++) ~^~~~~~~~~~