Submission #751986

#	Time	Username	Problem	Language	Result	Execution time	Memory
751986		minhcool	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	816 ms	103404 KiB

scrivener

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
 
#define ll long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
 
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;
 
const int N = 1e6 + 5;
 
const int oo = 1e18 + 7, mod = 1e9 + 7;
 
mt19937 rng(1);
 
int n;
 
int cnt;
 
int lst[N][25], len[N];
 
char cc[N];
 
 
void Init(){
  cnt = 0;
  for(int i = 0; i <= 20; i++) lst[0][i] = 0;
  len[0] = 0;
}
 
void TypeLetter(char c){
	cnt++;
	len[cnt] = len[cnt - 1] + 1;
	cc[cnt] = c;
	lst[cnt][0] = cnt - 1;
	for(int i = 1; i <= 20; i++) lst[cnt][i] = lst[lst[cnt][i - 1]][i - 1];
}
 
void UndoCommands(int x){
	cnt++;
	len[cnt] = len[cnt - x - 1];
	lst[cnt][0] = lst[cnt - x - 1][0];
	cc[cnt] = cc[cnt - x - 1];
	for(int i = 1; i <= 20; i++) lst[cnt][i] = lst[lst[cnt][i - 1]][i - 1];
}
 
char GetLetter(int x){
	x++;
	int temp = len[cnt] - x;
    //if(!temp) return cc[cnt];
	int pos = cnt;
	for(int i = 20; i >= 0; i--) if(temp & (1LL << i)) pos = lst[pos][i];
	return cc[pos];
}

Compilation message (stderr)

scrivener.cpp:18:21: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   18 | const int oo = 1e18 + 7, mod = 1e9 + 7;
      |                ~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 26 / 26
• Subtask 5: 40 / 40