Compilare: user.cpp: In function ‘int main()’: user.cpp:40:33: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (!(sign[i - 1] == -1 && sign[i] == +1 || ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ user.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (wrong.size() < k) { ~~~~~~~~~~~~~^~~ user.cpp:51:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = k - 1; i < wrong.size(); i++) ~~^~~~~~~~~~~~~~