Compilare: user.cpp: In member function ‘void aint::compute(int, int, int)’: user.cpp:50:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < data[node].size(); i++) { ^ user.cpp: In function ‘int cb(std::pair<int, int>)’: user.cpp:140:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘int main()’: user.cpp:154:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.in","r",stdin); ^ user.cpp:155:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.out","w",stdout); ^ user.cpp:157:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:158:70: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i = 1; i <= n; i++) scanf("%d%d", &P[i].first, &P[i].second); ^ user.cpp:163:72: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &p1.first, &p1.second, &p2.first, &p2.second); ^