Compilare: main.cpp: In function 'void dfs(int)': main.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < adj[nod].size(); i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:40: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::unordered_set<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(r, "%d\n", n - visited.size() ); ^ main.cpp:32:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &n, &m, &p); ^ main.cpp:36:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &x, &y); ^ main.cpp:42:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &ber); ^