Compilare: user.cpp: In function ‘void Dijkstra(int)’: user.cpp:53:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[node].size();++i) ^ user.cpp: In function ‘void DFS(int, int, int)’: user.cpp:78:31: 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:94:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d", &N,&M); ^ user.cpp:102:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d", &x, &y,&cost); ^