Compilare: main.cpp: In function 'std::vector<node*> mergeHeaps(std::vector<node*>&, std::vector<node*>&)': main.cpp:36:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos1 < h1.size() or pos2 < h2.size()) { ~~~~~^~~~~~~~~~~ main.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos1 < h1.size() or pos2 < h2.size()) { ~~~~~^~~~~~~~~~~ main.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos1 == h1.size()) { ~~~~~^~~~~~~~~~~~ main.cpp:41:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (pos2 == h2.size()) { ~~~~~^~~~~~~~~~~~ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < newH.size(); ++i) ~~^~~~~~~~~~~~~ main.cpp: In function 'node* getMin(std::vector<node*>&)': main.cpp:80:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < h.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'void deleteMin(std::vector<node*>&)': main.cpp:106:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < h.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'void removeNodeFromHeap(std::vector<node*>&, node*)': main.cpp:120:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < h.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:181:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:162:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ main.cpp:163:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^ main.cpp:165:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:168:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^