Compilare: main.cpp: In function 'int main()': main.cpp:55:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ones.size() <= can_handle + 2) { ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < groups.size() - 1; i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (groups.size() % 2 == 1 && i == groups.size() - 2) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:67:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < groups.size(); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:72:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] start_index = (i == 0 || i == groups.size() - 1) ? 1 : 2; ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:74:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = start_index; j < groups[i].size(); j++) ~~^~~~~~~~~~~~~~~~~~