Created
March 31, 2017 13:32
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#include <bits/stdc++.h> | |
using namespace std; | |
using ll = long long; | |
const int kSize = 101; | |
int main() { | |
#ifdef HOME | |
freopen("/home/acarus/input.txt", "r", stdin); | |
#endif | |
ios_base::sync_with_stdio(false); | |
string a, b; | |
while (cin >> a >> b) { | |
int lcs[kSize][kSize] = {}; | |
int parent[kSize][kSize]; | |
for (int i = 1; i <= a.size(); ++i) { | |
for (int j = 1; j <= b.size(); ++j) { | |
int c = a[i - 1] == b[j - 1] ? 1 : 0; | |
if (lcs[i - 1][j - 1] + c > lcs[i][j]) { | |
lcs[i][j] = lcs[i - 1][j - 1] + c; | |
parent[i][j] = c + 1; | |
} | |
if (lcs[i - 1][j] > lcs[i][j]) { | |
lcs[i][j] = lcs[i - 1][j]; | |
parent[i][j] = 3; | |
} | |
if (lcs[i][j - 1] > lcs[i][j]) { | |
lcs[i][j] = lcs[i][j - 1]; | |
parent[i][j] = 4; | |
} | |
} | |
} | |
vector<int> ca, cb; | |
int x = a.size(), y = b.size(); | |
while (x > 0 && y > 0) { | |
if (parent[x][y] == 2) { | |
ca.push_back(x - 1); | |
cb.push_back(y - 1); | |
} | |
if (parent[x][y] < 3) --x, --y; | |
else if (parent[x][y] == 3) --x; | |
else --y; | |
} | |
reverse(begin(ca), end(ca)); | |
reverse(begin(cb), end(cb)); | |
string ans = ""; | |
x = 0, y = 0; | |
for (int i = 0; i < ca.size(); ++i) { | |
while (x < ca[i]) ans += a[x], ++x; | |
while (y < cb[i]) ans += b[y], ++y; | |
ans += a[x]; | |
++x, ++y; | |
} | |
while (x < a.size()) ans += a[x++]; | |
while (y < b.size()) ans += b[y++]; | |
cout << ans << endl; | |
} | |
return 0; | |
} |
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