Compilare: main.cpp: In function 'int main()': main.cpp:51:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ones.size() <= can_handle + 2) { ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:53:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < groups.size() - 1; i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:57:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (groups.size() % 2 == 1 && i == groups.size() - 2) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:63:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < groups.size(); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:68:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] start_index = (i == 0 || i == groups.size() - 1) ? 1 : 2; ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:70:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = start_index; j < groups[i].size(); j++) ~~^~~~~~~~~~~~~~~~~~