Compilare: main.cpp: In function 'void convert()': main.cpp:12:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (unsigned i = 1; i <= digits[0]; ++i) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < N - K; ++k) ~~^~~~~~~ main.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= (N - K) - k && digits[i] > res_digits[k]) ~~^~~~~~~~~~~~~~ main.cpp:36:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= (N - K) - k && digits[i] > res_digits[k]) ~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:38:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int q = k, r = i; q < N - K; ++q) ~~^~~~~~~