Submission #243214

#	Time	Username	Problem	Language	Result	Execution time	Memory
243214		kimbj0709	Palindromic Partitions (CEOI17_palindromic)	C++14	100 / 100	84 ms	20708 KiB

palindromic

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define mod 1000000009
#define maxn 1000050
#define po 179
vector<int> powers(maxn,1);
void find(){
  string input;
  cin >> input;
  int sum1 = 0;
  int sum2 = 0;
  int ans = 0;
  int cnt = -1;
  int currcnt = 0;
  for(int i=0;i<input.length()/2;i++){
    sum1 += powers[currcnt]*(input.at(i)-'a');
    sum2 *= po;
    sum1 %= mod;
    sum2 %= mod;
    sum2 += (input.at(input.length()-1-i)-'a');
    currcnt++;
    sum2 %= mod;
    if(sum1==sum2){
      ans += 2;
      sum1 = 0;
      sum2 = 0;
      cnt = i;
      currcnt = 0;
    }
  }
  if((cnt+1)*2==input.length()){

  }
  else{
    ans++;
  }
  cout << ans << "\n";
}
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);cout.tie(0);
  int no_of_input;
  cin >> no_of_input;
  for(int i=1;i<powers.size();i++){
    powers[i] = powers[i-1]*po;
    powers[i] %= mod;
  }
  for(int i=0;i<no_of_input;i++){
    find();
  }

}

Compilation message (stderr)

palindromic.cpp: In function 'void find()':
palindromic.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<input.length()/2;i++){
               ~^~~~~~~~~~~~~~~~~
palindromic.cpp:32:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if((cnt+1)*2==input.length()){
      ~~~~~~~~~^~~~~~~~~~~~~~~~
palindromic.cpp: In function 'int32_t main()':
palindromic.cpp:45:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=1;i<powers.size();i++){
               ~^~~~~~~~~~~~~~

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