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Lexicographical LCS between 3 Strings.cpp
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Lexicographical LCS between 3 Strings.cpp
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/** Jai Shree Ram **/
/** ssavi. ICT-4 CoU **/
#include<bits/stdc++.h>
#define DIST(x1,x2, y1, y2) (((x1-x2)*(x1-x2))+((y1-y2)*(y1-y2)))
#define DIST3D(x1,x2, y1, y2, z1, z2) (((x1-x2)*(x1-x2))+((y1-y2)*(y1-y2)) + ((z1-z2)*(z1-z2)))
#define CLR(a) a.clear()
#define VCLR(a, n) for(int i=0; i<=n+3; i++) a[i].clear()
#define SIZE(a) a.size()
#define ERASE(a, b) memset(a, b, sizeof a)
#define pb push_back
#define LL long long
#define ULL unsigned long long
#define DBG cout<<"I Am Here"<<endl
#define DBGA(a) cout<<a<<endl
#define DBGI(b,a) cout<<b<<' '<<a<<endl
#define DBGL(i,s,e,b) or(int i=s; i<=e; i++) cout<<b<<endl
#define INF 1e9
#define INV 1e-6
#define sc(a) scanf("%I64d", &a)
#define pr(a) printf("%I64d\n", a)
#define si(a) scanf("%d", &a)
#define pii pair<int,int>
#define PIS pair<double,string>
#define PII pair<LL,LL>
#define MAX 600005
#define CASE(i) printf("Case %d:", i);
#define PI acos(-1)
#define piis pair<int, string>
#define fast1 ios_base::sync_with_stdio(false);
#define fast2 cin.tie(0)
#define CHECK_BIT(var,pos) ((var & (1 << pos)) == (1 << pos))
#define LOOP(i, b, n) for(i=b; i<=n; i++)
#define nl puts("")
using namespace std;
/** ---------------------------------------------- **/
/** Header And Defintions Ends Here. **/
/** ---------------------------------------------- **/
const double GRS = (1 + sqrt(5))/2;
LL power(int X, int P)
{
LL ans = 1;
for(int i=1; i<=P; i++){
ans = ans * (LL)X;
}
return ans;
}
LL ABS(LL A, LL B)
{
LL ret = A - B;
if(ret<0) return -ret;
return ret;
}
LL MOD = 1000000007;
const LL BIGMAX = power(2,63) - 1;
LL ADD(LL X, LL Y)
{
if(X+Y<0)
return (X - MOD) + Y;
else if(X+Y>=MOD)
return X+Y-MOD;
else
return X+Y;
}
LL prod(LL X, LL Y) // CUSTOM PRODUCT FUNCTION FOR BIG NUMBER MULTIPLICATION
{
if(Y==0 || X<=(BIGMAX/Y)) return (X*Y)%MOD;
LL result = 0;
if(X>Y) swap(X,Y);
while(X>0){
if(X&1!=0){
result = ADD(result, Y);
}
X>>=1;
Y -= MOD - Y;
if(Y<0)
Y = Y + MOD;
}
return result;
}
LL bigmod(LL a, LL b){
LL x = 1, y = a%MOD;
while(b > 0) {
if(b%2 == 1) {
x = prod(x,y);
}
y = prod(y,y);
b /= (LL)2;
}
return x;
}
LL MODINVERSE(LL a){
return bigmod(a, MOD-2);
}
LL ncrdp[900][1000];
LL NCR(int n, int r)
{
if(r==1) return n;
else if(n==r) return 1;
else
{
if(ncrdp[n][r]!=-1) return ncrdp[n][r];
else
{
ncrdp[n][r]=NCR(n-1,r) + NCR(n-1,r-1);
return ncrdp[n][r];
}
}
}
const int MAXN = 1000005;
int status[(MAXN/32)+10];
vector<int>primelist;
bool check(int n, int pos) { return (bool)(n & (1<<pos)); }
int SET(int n, int pos){ return n=n|(1<<pos);}
void sieve()
{
int sqrtN=int (sqrt(MAXN));
status[1>>5]=SET(status[1>>5],1&31);
for(int j=4; j<=MAXN; j=j+2)
status[j>>5]=SET(status[j>>5],j&31);
for(int i=3; i<=sqrtN; i=i+2)
{
if(check(status[i>>5],i&31)==0)
{
for(int j=i*i; j<=MAXN; j= j + (i<<1))
{
status[j>>5]=SET(status[j>>5],j&31);
}
}
}
primelist.push_back(2);
for(int i=3; i<=MAXN; i=i+2)
{
if(check(status[i>>5],i&31)==0) {
primelist.push_back(i);
}
}
}
/**----------------------------------------------------------------------------**/
/** Template Ends Here. Main Function And User Defined Functions Starts Here. **/
/**--------------------------------------------------------------------------**/
char a[55],b[55],c[55];
int dp[55][55][55],state[55][55][55],save[55][55][55][4],caseno=0, len1, len2, len3;
char alpha[123];
int lcs(int i, int j, int l)
{
if(i>=len1 || j>=len2 || l>=len3) return 0;
if(state[i][j][l]==caseno) return dp[i][j][l]; //save tym from clearing dp array frequently.
state[i][j][l]=caseno;
int ret=0;
save[i][j][l][0]=-1; // print er mto kono letter nei seta 1st e indicate kore dilam.
for(int k=0;k<52;k++) //'a' theke 'z' porjonto check
{
int p,q,r;
for(p=i;p<len1;p++) // k letter taki string duitay kommon ache??
if(a[p]==alpha[k]) break;
for(q=j;q<len2;q++)
if(b[q]==alpha[k]) break;
for(r=l;r<len3;r++)
if(c[r]==alpha[k]) break;
if(p==len1 || q==len2 || r==len3) continue;
int tamp=1+lcs(p+1,q+1,r+1); // common thakle next position e pathao.
if(tamp>ret) //eknkar ta max hle seta nao and letter k ke save koro , sathe save koro path keo.
{
ret=tamp;
save[i][j][l][0]=k;
save[i][j][l][1]=p+1;
save[i][j][l][2]=q+1;
save[i][j][l][3]=r+1;
}
}
return dp[i][j][l]=ret;
}
void print(int i, int j, int l)
{
if(i>=len1 || j>=len2 || l>=len3 || save[i][j][l][0]==-1) return;
printf("%c",alpha[save[i][j][l][0]]);
print(save[i][j][l][1],save[i][j][l][2], save[i][j][l][3]);
}
int main()
{
//fin("1110.txt");
char ch = 'A';
for(int i=0; i<52 ;i++){
alpha[i] = ch;
if(ch=='Z'){
ch = 'a';
}
else{
ch++;
}
}
int t;
scanf("%d", &t);
getchar();
while(t--)
{
scanf("%s",&a);
scanf("%s",&b);
scanf("%s",&c);
len1 = strlen(a);
len2 = strlen(b);
len3 = strlen(c);
++caseno;
int res=lcs(0,0,0);
printf("Case %d: ",caseno);
if(res==0) printf("0 T.A.T\n");
else
{
printf("%d ", res);
print(0,0,0);
nl;
}
}
return 0;
}