bits/stdc++.h is non-standard and unportable, replace with actually used headers

AMDmi3 · AMDmi3 · commit b19d373bfe7e · 2016-07-01T15:34:35.000+03:00
diff --git a/graph.cxx b/graph.cxx
@@ -1,4 +1,4 @@
-#include <bits/stdc++.h>
+#include <algorithm>
 
 #include "graph.hxx"
 #include "dsu.hxx"
diff --git a/main.cxx b/main.cxx
@@ -1,4 +1,6 @@
-#include <bits/stdc++.h>
+#include <cassert>
+#include <cstdio>
+#include <iostream>
 
 #include "graph.hxx"
 
