Compilare: user.cpp: In function ‘void toposort(int)’: user.cpp:43:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[c].size(); ++i) ^ user.cpp: In function ‘void afisare()’: user.cpp:54:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < r.size(); ++i) ^ user.cpp: In function ‘void citire()’: user.cpp:16:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.cpp:21:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &x, &y); ^