Submission #447605

#	Time	Username	Problem	Language	Result	Execution time	Memory
447605		fuad27	Palindromic Partitions (CEOI17_palindromic)	C++14	100 / 100	77 ms	12828 KiB

palindromic

    #include<iostream>
    using namespace std;
    #define int long long
    #define mod ((long long)(1e9)+(7L))
    #pragma GCC optimize("Ofast")
    #pragma GCC target("avx,avx2,fma")
    int32_t main () {
    	ios_base::sync_with_stdio(0);
    	cin.tie(0);
    	cout.tie(0);	
    	int t;
    	cin >> t;
    	while(t--) {
    		string s;
    		cin >> s;
    		int ans = 0, n = s.length();
    		long long hash1 = 0, hash2 = 0, pw = 1, cnt = 0, j = n;
    		for(int i = 0;i<n/2;i++) {
    			hash1 = (26*hash1%mod + (s[i] - 'a'))%mod;
    			hash2 = (hash2+((s[n-i-1]-'a'))*pw%mod)%mod;
    			if(hash1 == hash2){
    				hash1 = 0;
    				hash2 = 0;
    				ans+=2;
    				pw = 1;
    				j = i;
    			}
    			else pw=26*pw%mod;
    		}
    		if(j!=(n/2)-1 or n%2)ans++;
    		cout<<ans<<'\n';
    	}
    }

Compilation message (stderr)

palindromic.cpp: In function 'int32_t main()':
palindromic.cpp:17:47: warning: unused variable 'cnt' [-Wunused-variable]
   17 |       long long hash1 = 0, hash2 = 0, pw = 1, cnt = 0, j = n;
      |                                               ^~~

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40