Compilare: user.cpp: In function ‘int main()’: user.cpp:83:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 2; i <= n; i++) { ^ user.cpp:33:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:44:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &x, &y, &cost); ^