As a student (during my high school and university days), I've participated in 4 international programming contests... I never win any -_-'... however, from these contests, I got a lot of experiences...

In reverse chronological order, they are:

2004 - ACM International Collegiate Programming Contest (ACM ICPC)
Shanghai Jiaotong University, Shanghai, China
3 - 8 December 2004
Team: Wang Zirui, Nguyen Viet Bang, Steven Halim
Coach: Dr Tan Sun Teck
Result: 25th place (honorable mention)

Click here for the detailed story

2003 - ACM International Collegiate Programming Contest (ACM ICPC)
University of Aizu, Japan
31 October - 5 November 2003
Team: Teng Junbin, Melvin Zhang Zhiyong, Steven Halim
Coach: Dr Tan Sun Teck, Mr. Zhu Wenbin
Result: 11th place (honorable mention)

Click here for the detailed story

2001 - ACM International Collegiate Programming Contest (ACM ICPC)
Nanyang Auditorium, Nanyang Technological University, Singapore
29 - 30 November 2001
Team: Steven Halim, Zhang Kaicheng, James Chew Bak Teck
Coach: Prof Andrew Lim, Mr. Andy Kurnia
Result: 6th place

ACM ICPC 2001, photo taken during contest (30/11/2001), my team is the one circled.

ACM ICPC 2001 Student counselors (NTU School of Computer Engineering)

1999 - International Schools Software Competition (ISSC)
School of Computing, National University of Singapore
30 November - 5 December 1999
Team: Ilham Winata Kurnia, Yudha Irsandy, Steven Halim
Result: 6th place out of 18 teams, thanks to Ilham (my team leader at that time).

From left to right:
Victor Ilham Kurnia, Fabianus Hendriyan Mulawadi,
Herman (Coach, Bina Nusantara University, Indonesia),
Widagdo Setiawan, Yudha Irsandy, Steven Halim
Photo taken at: Suntec City, 3 December 1999, before Awards Dinner

ISSC 1999 Student Guides.