Compilare: main.cpp: In function 'void bkt(int)': main.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t t = 1; t < index; t++) ~~^~~~~~~ main.cpp:45:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= k; i++) ~~^~~~ main.cpp: In function 'int main()': main.cpp:90:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= k; i++) ~~^~~~