Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[k].size(); i++) ~~^~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:43:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sol.size(); i++) ~~^~~~~~~~~~~~ user.cpp:25:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, a, b; ^ user.cpp:26:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d%d%d", &n, &m, &p); ^ user.cpp:29:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d%d", &a, &b); ^ user.cpp:34:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &ber[i]); ^