#include<bits/stdc++.h>
using namespace std;
const int maxn=10000;
int n,m;
int base=31,mod=1e9+7;
long long mp[maxn],revmp[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;
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
mp[0]=1;
for(int i=1;i<maxn;i++){
mp[i]=mp[i-1]*base%mod;
}
revmp[maxn-1]=mypow(mp[maxn-1],mod-2);
for(int i=maxn-2;i>=0;i--){
revmp[i]=revmp[i+1]*base%mod;
}
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);
long long unnow=0;
for(int i=1;i<=n;i++){
hashn[i]=hashn[i-1]+mp[i-1]*s[i-1]%mod;
hashn[i]%=mod;
}
unnow=0;
for(int i=n;i>0;i--){
revhashn[i]=revhashn[i+1]+mp[n-i]*s[i-1]%mod;
revhashn[i]%=mod;
}
unnow=0;
for(int i=1;i<=m;i++){
hashm[i]=hashm[i-1]+ss[i-1]*mp[i-1]%mod;
hashm[i]%=mod;
}
unnow=0;
for(int i=m;i>0;i--){
revhashm[i]=revhashm[i+1]+mp[m-i]*ss[i-1]%mod;
revhashm[i]%=mod;
}
unnow=0;
vector<pair<long long ,int>>allh[n+1];
for(int i=1;i<=n;i++){
for(int j=i;j<=n;j++){
long long fake=mod+mod+hashn[j]-hashn[i-1];
fake%=mod;
fake*=revmp[i-1];
fake%=mod;
allh[j-i+1].push_back(make_pair(fake,i));
// if(i==4&&j==n){
// cout<<fake<<" 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;
}
unnow=0;
for(int h=i;h<=j;h++){
long long fake=mod+mod+hashm[j]-hashm[h-1];
fake%=mod;
fake*=revmp[h-1];
fake+=(hashm[h]-hashm[i-1]+mod+mod)*revmp[i-1]%mod*mp[j-h+1];
fake%=mod;
int p=lower_bound(allh[j-i+1].begin(),allh[j-i+1].end(),make_pair(fake,-1))-allh[j-i+1].begin();
if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==fake){
res=max(res,make_pair(j-i+1,make_pair(i,allh[j-i+1][p].second)));
}
fake=mod+mod+revhashm[i]-revhashm[h+1];
fake%=mod;
fake*=revmp[m-h];
fake+=(mod+mod+revhashm[h+1]-revhashm[j+1])*revmp[m-j]%mod*mp[h-i+1]%mod;
fake%=mod;
// if(i==3&&j==6&&h==4){
// cout<<fake<<" 2"<<endl;
// }
p=lower_bound(allh[j-i+1].begin(),allh[j-i+1].end(),make_pair(fake,-1))-allh[j-i+1].begin();
if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==fake){
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:91:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
91 | if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==fake){
| ~^~~~~~~~~~~~~~~~~~~~
necklace.cpp:103:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
103 | if(p!=allh[j-i+1].size()&&allh[j-i+1][p].first==fake){
| ~^~~~~~~~~~~~~~~~~~~~
necklace.cpp:38:16: warning: variable 'unnow' set but not used [-Wunused-but-set-variable]
38 | long long unnow=0;
| ^~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Partially correct |
7 ms |
596 KB |
Output is partially correct |
| 2 |
Partially correct |
3 ms |
596 KB |
Output is partially correct |
| 3 |
Correct |
16 ms |
468 KB |
Output is correct |
| 4 |
Partially correct |
12 ms |
624 KB |
Output is partially correct |
| 5 |
Partially correct |
23 ms |
616 KB |
Output is partially correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Partially correct |
7 ms |
596 KB |
Output is partially correct |
| 2 |
Partially correct |
3 ms |
596 KB |
Output is partially correct |
| 3 |
Correct |
16 ms |
468 KB |
Output is correct |
| 4 |
Partially correct |
12 ms |
624 KB |
Output is partially correct |
| 5 |
Partially correct |
23 ms |
616 KB |
Output is partially correct |
| 6 |
Partially correct |
508 ms |
2388 KB |
Output is partially correct |
| 7 |
Incorrect |
113 ms |
2388 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Partially correct |
7 ms |
596 KB |
Output is partially correct |
| 2 |
Partially correct |
3 ms |
596 KB |
Output is partially correct |
| 3 |
Correct |
16 ms |
468 KB |
Output is correct |
| 4 |
Partially correct |
12 ms |
624 KB |
Output is partially correct |
| 5 |
Partially correct |
23 ms |
616 KB |
Output is partially correct |
| 6 |
Partially correct |
508 ms |
2388 KB |
Output is partially correct |
| 7 |
Incorrect |
113 ms |
2388 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
