diff --git a/UltiSnips/python.snippets b/UltiSnips/python.snippets
index a47544117..d3af9b1eb 100644
--- a/UltiSnips/python.snippets
+++ b/UltiSnips/python.snippets
@@ -6,7 +6,7 @@ priority -50
 
 #! header
 snippet #! "#!/usr/bin/env python" b
-#!/usr/bin/env python
+#!/usr/bin/env python3
 $0
 endsnippet
 
diff --git a/snippets/c.snippets b/snippets/c.snippets
index a3f4d5c99..c6e72842a 100644
--- a/snippets/c.snippets
+++ b/snippets/c.snippets
@@ -390,3 +390,16 @@ snippet asm
 	:
 	:
 	);
+
+snippet sd
+	scanf("%d", &${0:n});
+snippet s2d
+	scanf("%d%d", &${1:m}, &${0:n});
+snippet wsd
+	while (scanf("%d", &${1:n}) == 1) {
+		${0}
+	}
+snippet pdn
+	printf("%d\n", ${0:n});
+snippet pd
+	printf("%d", ${0:n});
diff --git a/snippets/cpp.snippets b/snippets/cpp.snippets
index bb9528a6f..52fd77137 100644
--- a/snippets/cpp.snippets
+++ b/snippets/cpp.snippets
@@ -1,10 +1,30 @@
 extends c
+## Main
+# main(void)
+snippet cppmain
+	#include <iostream>
+	${1}
+	using namespace std;
+
+	int main() {
+	${0}
+		return 0;
+	}
+
+snippet cmain
+	#include <cstdio>
+	${1}
+	using namespace std;
+
+	int main() {
+	${0}
+		return 0;
+	}
 
 ## Main
 # main()
 snippet mainn
-	int main()
-	{
+	int main() {
 		${0}
 		return 0;
 	}
@@ -13,6 +33,8 @@ snippet mainn
 # #include <...>
 snippet incc
 	#include <${1:iostream}>
+snippet incv
+	#include <${1:vector}>
 snippet binc
 	#include <boost/${1:shared_ptr}.hpp>
 ##
@@ -23,6 +45,8 @@ snippet array
 # std::vector
 snippet vector
 	std::vector<${1:T}> ${2};
+snippet vvi
+	vector<vector<int>> ${1}(${2:n}, vector<int>(${3:m}, ${4:0}));
 # std::deque
 snippet deque
 	std::deque<${1:T}> ${2};
@@ -190,7 +214,6 @@ snippet fori
 	for (int ${2:i} = 0; $2 < ${1:count}; $2${3:++}) {
 		${4}
 	}
-
 # foreach
 snippet fore
 	for (${1:auto} ${2:i} : ${3:container}) {
@@ -277,3 +300,55 @@ snippet gtepar "GTest:add parameterized test"
 # GTest:instantiate parameterized test
 snippet gteparins "GTest:instantiate parameterized test"
 	INSTANTIATE_TEST_SUITE_P(${1:InstantiationName}, ${2:SuiteName}, ${0});
+
+snippet sedge "struct edge"
+	struct edge {
+		int to, next;
+		edge(int to, int next) : to(to), next(next) {}
+	};
+
+snippet sedgew "struct edge"
+	struct edge {
+		int to, next, w;
+		edge(int to, int next, int w) : to(to), next(next), w(w) {}
+	};
+
+snippet vi "vector<int>"
+	vector<int>
+
+snippet cgraph "class Graph"
+	struct Edge {
+		int to, next;
+		Edge(int to, int next) : to(to), next(next) {}
+	};
+
+	class Graph {
+		vector<int> head;
+		vector<Edge> edges;
+	public:
+		Graph(int n) : head(n + 1, -1) {}
+		void add_edge(int u, int v) {
+			edges.emplace_back(v, head[u]);
+			head[u] = edges.size() - 1;
+		}
+		${0}
+	};
+
+snippet cgraphw "class Graph"
+	struct Edge {
+		int to, next, w;
+		Edge(int to, int next, int w) : to(to), next(next), w(w) {}
+	};
+
+	class Graph {
+		vector<int> head;
+		vector<Edge> edges;
+	public:
+		Graph(int n) : head(n + 1, -1) {}
+		void add_edge(int u, int v, int w) {
+			edges.emplace_back(v, head[u], w);
+			head[u] = edges.size() - 1;
+		}
+		${0}
+	};
+