#include<bits/stdc++.h>
using namespace std;
const int maxn=10000;
int n,m;
int base=29,mod=923478557,base2=31,mod2=1e9+7;
int ww(int a){
if(a>=mod){
a-=mod;
}
return a;
}
int ww2(int a){
if(a>=mod2){
a-=mod2;
}
return a;
}
int mp[maxn],revmp[maxn],mp2[maxn],revmp2[maxn];
long long mypow(long long m,long long y){
if(y==0){
return 1;
}
long long p=mypow(m,(y>>1));
p*=p;
p%=mod;
if(y&1){
p*=m;
p%=mod;
}
return p;
}
long long mypow2(long long m,long long y){
if(y==0){
return 1;
}
long long p=mypow(m,(y>>1));
p*=p;
p%=mod2;
if(y&1){
p*=m;
p%=mod2;
}
return p;
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
mp[0]=1;
mp2[0]=1;
for(int i=1;i<maxn;i++){
mp[i]=1ll*mp[i-1]*base%mod;
mp2[i]=1ll*mp2[i-1]*base2%mod2;
}
revmp[maxn-1]=mypow(mp[maxn-1],mod-2);
revmp2[maxn-1]=mypow2(mp2[maxn-1],mod2-2);
for(int i=maxn-2;i>=0;i--){
revmp[i]=1ll*revmp[i+1]*base%mod;
revmp2[i]=1ll*revmp2[i+1]*base2%mod2;
}
string s,ss;
cin>>s>>ss;
n=s.size();
m=ss.size();
vector<int>hashn(n+2),revhashn(n+2),hashm(m+2),revhashm(m+2);
vector<int>hashn2(n+2),revhashn2(n+2),hashm2(m+2),revhashm2(m+2);
for(int i=1;i<=n;i++){
hashn[i]=(1ll*mp[i-1]*s[i-1]+hashn[i-1])%mod;
hashn2[i]=(1ll*mp2[i-1]*s[i-1]+hashn2[i-1])%mod2;
}
for(int i=n;i>0;i--){
revhashn[i]=(1ll*mp[n-i]*s[i-1]+revhashn[i+1])%mod;
revhashn2[i]=(1ll*mp2[n-i]*s[i-1]+revhashn2[i+1])%mod2;
}
for(int i=1;i<=m;i++){
hashm[i]=(1ll*ss[i-1]*mp[i-1]+hashm[i-1])%mod;
hashm2[i]=(1ll*ss[i-1]*mp2[i-1]+hashm2[i-1])%mod2;
}
for(int i=m;i>0;i--){
revhashm[i]=(1ll*mp[m-i]*ss[i-1]+revhashm[i+1])%mod;
revhashm2[i]=(1ll*mp2[m-i]*ss[i-1]+revhashm2[i+1])%mod2;
}
vector<pair<pair<int,int>,int>>allh[n+1];
for(int i=1;i<=n;i++){
for(int j=i;j<=n;j++){
int fake=mod+hashn[j]-hashn[i-1];
int fake2=mod2+hashn2[j]-hashn2[i-1];
fake=ww(fake);
fake2=ww2(fake2);
fake2=1ll*fake2*revmp2[i-1]%mod2;
fake=1ll*fake*revmp[i-1]%mod;
allh[j-i+1].push_back(make_pair(make_pair(fake,fake2),i));
// if(i==4&&j==n){
// cout<<fake2<<" 1"<<endl;
// }
}
}
for(int i=0;i<=n;i++){
sort(allh[i].begin(),allh[i].end());
allh[i].resize(unique(allh[i].begin(),allh[i].end())-allh[i].begin());
}
pair<int,pair<int,int>>res;
res.first=-1;
for(int i=1;i<=m;i++){
for(int j=i;j<=m;j++){
if(j-i+1>n||j-i+1<=res.first){
continue;
}
for(int h=i;h<=j;h++){
int fake=mod+hashm[j]-hashm[h-1];
int fake2=mod2+hashm2[j]-hashm2[h-1];
fake=ww(fake);
fake2=ww2(fake2);
fake=1ll*fake*revmp[h-1]%mod;
fake2=1ll*fake2*revmp2[h-1]%mod2;
fake+=1ll*(hashm[h]-hashm[i-1]+mod)*revmp[i-1]%mod*mp[j-h+1]%mod;
fake2+=1ll*(hashm2[h]-hashm2[i-1]+mod2)*revmp2[i-1]%mod2*mp2[j-h+1]%mod2;
fake=ww(fake);
fake2=ww(fake2);
int p=lower_bound(allh[j-i+1].begin(),allh[j-i+1].end(),make_pair(make_pair(fake,fake2),-1))-allh[j-i+1].begin();
if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==make_pair(fake,fake2)){
res=max(res,make_pair(j-i+1,make_pair(i,allh[j-i+1][p].second)));
}
fake=mod+revhashm[i]-revhashm[h+1];
fake2=mod2+revhashm2[i]-revhashm2[h+1];
// if(i==3&&j==6&&h==4){
// cout<<fake<<" 2 "<<endl;
// }
fake=ww(fake);
fake2=ww2(fake2);
fake=1ll*fake*revmp[m-h]%mod;
fake2=1ll*fake2*revmp2[m-h]%mod2;
int z=1ll*(mod+revhashm[h+1]-revhashm[j+1])*revmp[m-j]%mod*mp[h-i+1]%mod;
int z2=1ll*(mod2+revhashm2[h+1]-revhashm2[j+1])*revmp2[m-j]%mod2*mp2[h-i+1]%mod2;
fake+=z;
fake2+=z2;
fake2=ww(fake2);
fake=ww(fake);
// if(i==3&&j==6&&h==4){
// cout<<fake<<" 2 "<<z<<endl;
// }
p=lower_bound(allh[j-i+1].begin(),allh[j-i+1].end(),make_pair(make_pair(fake,fake2),-1))-allh[j-i+1].begin();
if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==make_pair(fake,fake2)){
res=max(res,make_pair(j-i+1,make_pair(i,allh[j-i+1][p].second)));
}
}
}
}
if(res.first==-1){
cout<<-1<<"\n";
return 0;
}
cout<<res.first<<"\n";
cout<<res.second.second-1<<" "<<res.second.first-1<<"\n";
}
Compilation message
necklace.cpp: In function 'int main()':
necklace.cpp:121:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
121 | if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==make_pair(fake,fake2)){
| ~^~~~~~~~~~~~~~~~~~~~
necklace.cpp:143:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
143 | if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==make_pair(fake,fake2)){
| ~^~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
468 KB |
Output is correct |
| 2 |
Correct |
2 ms |
468 KB |
Output is correct |
| 3 |
Partially correct |
17 ms |
556 KB |
Output is partially correct |
| 4 |
Correct |
13 ms |
596 KB |
Output is correct |
| 5 |
Partially correct |
26 ms |
468 KB |
Output is partially correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
468 KB |
Output is correct |
| 2 |
Correct |
2 ms |
468 KB |
Output is correct |
| 3 |
Partially correct |
17 ms |
556 KB |
Output is partially correct |
| 4 |
Correct |
13 ms |
596 KB |
Output is correct |
| 5 |
Partially correct |
26 ms |
468 KB |
Output is partially correct |
| 6 |
Partially correct |
451 ms |
1900 KB |
Output is partially correct |
| 7 |
Partially correct |
780 ms |
1900 KB |
Output is partially correct |
| 8 |
Partially correct |
916 ms |
1876 KB |
Output is partially correct |
| 9 |
Execution timed out |
1547 ms |
1748 KB |
Time limit exceeded |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
468 KB |
Output is correct |
| 2 |
Correct |
2 ms |
468 KB |
Output is correct |
| 3 |
Partially correct |
17 ms |
556 KB |
Output is partially correct |
| 4 |
Correct |
13 ms |
596 KB |
Output is correct |
| 5 |
Partially correct |
26 ms |
468 KB |
Output is partially correct |
| 6 |
Partially correct |
451 ms |
1900 KB |
Output is partially correct |
| 7 |
Partially correct |
780 ms |
1900 KB |
Output is partially correct |
| 8 |
Partially correct |
916 ms |
1876 KB |
Output is partially correct |
| 9 |
Execution timed out |
1547 ms |
1748 KB |
Time limit exceeded |
| 10 |
Halted |
0 ms |
0 KB |
- |
