From fd6adf295b528e36c54cd193dfda83f7d3acd257 Mon Sep 17 00:00:00 2001 From: JBatzill Date: Sat, 22 Nov 2014 16:44:14 +0100 Subject: Create LCSubSequence.cpp --- string/LCSubSequence.cpp | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 string/LCSubSequence.cpp (limited to 'string') diff --git a/string/LCSubSequence.cpp b/string/LCSubSequence.cpp new file mode 100644 index 0000000..0ea2913 --- /dev/null +++ b/string/LCSubSequence.cpp @@ -0,0 +1,17 @@ +string lcss(string &a, string &b) { + int m[a.length() + 1][b.length() + 1], x=0, y=0; + memset(m, 0, sizeof(m)); + for(int y = a.length() - 1; y >= 0; y--) { + for(int x = b.length() - 1; x >= 0; x--) { + if(a[y] == b[x]) m[y][x] = 1 + m[y+1][x+1]; + else m[y][x] = max(m[y+1][x], m[y][x+1]); + } + } //for length only: return m[0][0]; + string res; + while(x < b.length() && y < a.length()) { + if(a[y] == b[x]) res += a[y++], x++; + else if(m[y][x+1] > m[y+1][x+1]) x++; + else y++; + } + return res; +} -- cgit v1.2.3