Compilare: user.cpp: In member function ‘void Heap::pop()’: user.cpp:51:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (2 * t + 1 < h.size()) { ^ user.cpp:53:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (f + 1 < h.size() && h[f + 1].val < h[f].val) f++; ^ user.cpp: In member function ‘void Dijkstra::dist()’: user.cpp:87:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:117:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("catun.in","r",stdin); ^ user.cpp:118:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("catun.out", "w", stdout); ^ user.cpp:119:34: 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:121:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &dd[i]); ^ user.cpp:124:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &c); ^