Compilare: main.cpp: In function 'int main()': main.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(v);i++) ~^~~~~~~~~~ main.cpp:14:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(v[i]>='a'&& v[i]<='z'|| v[i]>='A' && v[i]<='Z') ~~~~~~~~~^~~~~~~~~~~~ main.cpp:9:10: warning: unused variable 'x' [-Wunused-variable] char x,v[300001]; ^