Compilare: user.cpp: In function ‘void prim()’: user.cpp:85:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 2; i <= n; i ++ ) ^ user.cpp:81:16: warning: unused variable ‘j’ [-Wunused-variable] unsigned int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:123:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ user.cpp:128:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(in, "%d %d %d", &x, &y, &z); ^