Compilare: user.cpp: In function ‘double kruskal(int)’: user.cpp:74:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < M.size() && nodes < n; i++) ^ user.cpp: In function ‘int main()’: user.cpp:98:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:102:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &p[i].x, &p[i].y); ^