foo.cc: In function 'int main()':
foo.cc:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < str.length(); i++)
                     ~~^~~~~~~~~~~~~~
foo.cc:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (j = 0, k = i; j < s0.length(); j++, k++)
                                ~~^~~~~~~~~~~~~
foo.cc:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(j == s0.length() && (k == str.length() || str[k] == ' '))
                ~~^~~~~~~~~~~~~~
foo.cc:27:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(j == s0.length() && (k == str.length() || str[k] == ' '))
                                     ~~^~~~~~~~~~~~~~~
foo.cc:36:31: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
         cout << ans << " " << p <<endl;
                               ^

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