Compilare: main.cpp: In function 'bool isName(char)': main.cpp:28:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return (c>='0' && c<='9' || c>='a' && c<='z' || c>='A' && c<='Z'); ~~~~~~~^~~~~~~~~ main.cpp:28:60: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return (c>='0' && c<='9' || c>='a' && c<='z' || c>='A' && c<='Z'); ~~~~~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:115:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<res.size();++i) ~^~~~~~~~~~~ main.cpp:116:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<res.size();++j) ~^~~~~~~~~~~