Compilare: main.cpp: In function 'void radixSort(unsigned int, unsigned int*, unsigned int*, unsigned int)': main.cpp:162:15: warning: operation on 'i' may be undefined [-Wsequence-point] index[++i] = index[i - 1] + frequence[i - 1]; ^~~ main.cpp:162:15: warning: operation on 'i' may be undefined [-Wsequence-point] main.cpp: In function 'int main()': main.cpp:173:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; ++i) ~~^~~ main.cpp:182:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; ++i) ~~^~~