Compilare: user.cpp: In function ‘int main()’: user.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (bit.count () == n - 1 && dist[s] == 0) ~~~~~~~~~~~~~^~~~~~~~ user.cpp:16:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &t); ^ user.cpp:18:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d", &n, &m, &s); ^ user.cpp:20:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &dist[i]); ^ user.cpp:22:41: 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, &c); ^