Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); ++i) ^ user.cpp: In function ‘void ctc(int)’: user.cpp:40:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vinv[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:95:46: warning: value computed is not used [-Wunused-value] printf("%d", l[soln[i]]-l[soln[i]-1])+1; ^ user.cpp:56:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.in", "r", stdin); ^ user.cpp:57:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.out", "w", stdout); ^ user.cpp:61:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:64:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^