Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:50:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vertices[start_node].size(); i++) ^ user.cpp:39:6: warning: unused variable ‘dist’ [-Wunused-variable] int dist = 1; ^ user.cpp: In function ‘int main()’: user.cpp:72:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i < answer.size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:21:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(iFile, "%d %d", &nodes, &edges); ^ user.cpp:23:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(iFile, "%d %d", &source, &destination); ^ user.cpp:31:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(iFile, "%d %d", &source, &destination); ^