Compilare: user.cpp: In function ‘int main()’: user.cpp:72:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < edges.size(); i++) { ^ user.cpp:79:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < edges.size(); i++) { ^ user.cpp:57:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fd, "%d", &V); ^ user.cpp:58:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fd, "%d", &E); ^ user.cpp:64:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fd, "%d", &v1); ^ user.cpp:65:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fd, "%d", &v2); ^