Compilare: user.cpp: In function ‘void solve()’: user.cpp:62:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < ap[node].size() && ap[node][pos].first < tribe.first) pos++; ^ user.cpp:63:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos == ap[node].size() || ap[node][pos].first != tribe.first) continue; ^ user.cpp: In function ‘void input()’: user.cpp:13:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &k); ^ user.cpp:15:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t[i]); ^ user.cpp:19:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:83:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tribes.in","r",stdin); ^ user.cpp:84:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tribes.out","w",stdout); ^