Compilare: user.cpp: In function ‘bool bellmanford(int)’: user.cpp:22:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < edges.size(); ++j) ^ user.cpp:32:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < edges.size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:49:31: 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:53:41: 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, &c); ^