Compilare: main.cpp: In function 'int main()': main.cpp:15:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp:23:10: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (s[j - 1] == '/') ^ main.cpp:38:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 2; i < s.size(); ++i) ~~^~~~~~~~~~