Compilare: main.cpp: In function 'int main()': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i < N; i++) // N-1 drumuri ~~^~~ main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= N; i++) ~~^~~~ main.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < M; i++) ~~^~~