Compilare: main.cpp: In function 'int main()': main.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(a[i].s)>maxim)maxim=strlen(a[i].s); ~~~~~~~~~~~~~~^~~~~~ main.cpp:31:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(a[i].s)>=j+1) ~~~~~~~~~~~~~~^~~~~