+ code examples

content/1_Intro/Intro_Problems.md

@@ -14,15 +14,116 @@ Demonstrates how to read in input and print output for a USACO problem in multip
 
 <!-- END DESCRIPTION -->
 
-Let's begin by solving a few fun problems! The following problems require relatively little programming experience and no algorithmic knowledge.
+## [Fence Painting](http://usaco.org/index.php?page=viewproblem2&cpid=567)
 
-Do as many as you want, then move on! You do not have to do all of them.
+(link to USACO website stuff?)
 
-<!-- END DESCRIPTION -->
+(auto newlines)
+
+### C++
+
+#### Method 1
+
+Use [freopen](http://www.cplusplus.com/reference/cstdio/freopen/). If you comment out both of the lines containing `freopen` then the program reads from standard in and writes to standard out as usual.
+
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+	freopen("paint.in","r",stdin); // reuse standard in to read from "paint.in"
+	freopen("paint.out","w",stdout); // reuse standard out to write to "paint.out"
+	vector<bool> cover(100);
+	int a, b, c, d; cin >> a >> b >> c >> d;
+	for (int i = a; i < b; ++i) cover[i] = 1;
+	for (int i = c; i < d; ++i) cover[i] = 1;
+	int ans = 0; 
+	for (int i = 0; i < 100; ++i) ans += cover[i];
+	cout << ans;
+}
+```
+
+#### Method 2
+
+Use [ifstream & ofstream](http://www.cplusplus.com/doc/tutorial/files/).
+
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+	ifstream fin("paint.in");
+	ofstream fout("paint.out");
+	vector<bool> cover(100);
+	int a, b, c, d; fin >> a >> b >> c >> d;
+	for (int i = a; i < b; ++i) cover[i] = 1;
+	for (int i = c; i < d; ++i) cover[i] = 1;
+	int ans = 0; 
+	for (int i = 0; i < 100; ++i) ans += cover[i];
+	fout << ans;
+}
+```
+
+### Java
+
+(link?)
+
+(Scanner?)
+
+(FastScanner?)
+
+Class name can be whatever you want.
+
+```java
+import java.io.*;
+import java.util.*;
+public class paintSol { must be declared in paintSol.java
+	public static void main(String[] args) throws IOException {
+		BufferedReader br = new BufferedReader(new FileReader("paint.in"));
+		PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("paint.out")));
+		int[] cover = new int[100];
+
+		StringTokenizer st = new StringTokenizer(br.readLine());
+		int a = Integer.parseInt(st.nextToken()), b = Integer.parseInt(st.nextToken());
+		st = new StringTokenizer(br.readLine());
+		int c = Integer.parseInt(st.nextToken()), d = Integer.parseInt(st.nextToken());
+
+		for (int i = a; i < b; ++i) cover[i] = 1;
+		for (int i = c; i < d; ++i) cover[i] = 1;
+		int ans = 0; 
+		for (int i = 0; i < 100; ++i) ans += cover[i];
+		pw.println(ans); 
+		pw.close();
+	}
+}
+```
+
+### Python 3
+
+See [here](https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files).
+
+```py
+fin = open("paint.in","r")
+fout = open("paint.out","w")
+cover = [0 for i in range(100)]
+a,b = map(int,fin.readline().split())
+c,d = map(int,fin.readline().split())
+for i in range(a,b):
+	cover[i] = 1
+for i in range(c,d):
+	cover[i] = 1
+ans = 0
+for i in range(100):
+	ans += cover[i]
+fout.write(str(ans))
+```
 
 ## Problems
 
+Let's begin by solving a few problems! The following require relatively little programming experience and no algorithmic knowledge.
+
+Do as many as you want, then move on! You do not have to do all of them.
+
 - [Promotion Counting](http://usaco.org/index.php?page=viewproblem2&cpid=591)
 - [Word Processor](http://usaco.org/index.php?page=viewproblem2&cpid=987)
-- [Fence Painting](http://usaco.org/index.php?page=viewproblem2&cpid=567)
 - [Square Pasture](http://usaco.org/index.php?page=viewproblem2&cpid=663)

content/2_General/2_Contests.md

@@ -5,6 +5,10 @@ author: Benjamin Qi
 order: 2
 ---
 
+Contests that I participate in, as well as a few tools.
+
+<!-- END DESCRIPTION -->
+
 See [clist.by](https://clist.by/coder/bqi343/) for an extensive list. Most of the contests which I do are a subset of those shown in "Programming Contests.png". A link to my google calendar for contests is available [here.](https://calendar.google.com/calendar?cid=Y2s5ZjdmZDBkNjdmOGFxZ2oxbDVrMHJ1OGtAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ) See the other page for olympiads such as USACO.
 
 Make sure to [upsolve](https://en.wiktionary.org/wiki/upsolve) after the contest ends! I particularly enjoy problems from AtCoder and CSAcademy. :)