/in/foo.cc: In function 'int main()':
/in/foo.cc:19:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j = 0; j < p[i].pwd.length(); j++){
                   ~~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:20:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(p[i].pwd[j] >= 'a' && p[i].pwd[j] <= 'z' || p[i].pwd[j] >= 'A' && p[i].pwd[j] <= 'Z'){