Compilare: user.cpp: In function ‘void df(int)’: user.cpp:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); ++i) ^ user.cpp:45:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<q[nod].size(); ++i) ^ user.cpp: In function ‘void df2(int)’: user.cpp:61:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<q[nod].size(); ++i) ^ user.cpp:76:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); ++i) ^ user.cpp:108:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<q[nod].size(); ++i) ^ user.cpp: In function ‘void df0(int)’: user.cpp:123:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:167:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb4.in", "r", stdin); ^ user.cpp:168:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb4.out", "w", stdout); ^ user.cpp:170:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:174:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^ user.cpp:190:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^