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72_editDistance.cpp
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45 lines (35 loc) · 891 Bytes
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#include <iostream>
#include <vector>
using namespace std;
int minDistance(string word1, string word2)
{
int m = word1.size();
int n = word2.size();
vector<int> cur(n+1, 0);
vector<int> pre(n+1, 0);
for (int i = 0; i <= n; ++i) {
pre[i] = i;
}
for (int i = 1; i <= m; ++i) {
cur[0] = i;
for (int j = 1; j <= n; ++j) {
if (word1[i-1] == word2[j-1]) {
cur[j] = pre[j - 1];
}
else {
cur[j] = 1 + std::min(pre[j-1], std::min(cur[j-1], pre[j]));
}
}
fill(pre.begin(), pre.end(), 0);
swap(pre, cur);
}
return pre[n];
}
int main(int argc, char const *argv[])
{
std::string word1 = "horse";
std::string word2 = "ros";
auto ret = minDistance(word1, word2);
cout << "result is " << ret << endl;
return 0;
}