Compilare: main.cpp: In function 'int main()': main.cpp:32:40: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d ", Sol[i].size()); ^ main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<Sol[i].size(); ++j) printf("%d ", Sol[i][j]); ~^~~~~~~~~~~~~~ main.cpp: In function 'void DFS(int)': main.cpp:64:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<Vc.size(); ++k) Sol[Vc[0]].push_back(Vc[k]); ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:17:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("retele.in", "r", stdin); ^ main.cpp:18:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("retele.out", "w", stdout); ^ main.cpp:19:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:24:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^