Submission #574316

#	Time	Username	Problem	Language	Result	Execution time	Memory
574316		keta_tsimakuridze	Crayfish scrivener (IOI12_scrivener)	C++14	0 / 100	401 ms	75612 KiB

scrivener

#include<bits/stdc++.h>
#define prev Prev
using namespace std;
const int N = 1000005;
int id, c[N][25], prev[N];
vector<char> s;
void Init() {
	s.push_back('0');
}
void TypeLetter(char L) {
	id++;
	c[id][0] = id;
	s.push_back(L);
	prev[id] = c[id - 1][0];
	for(int i = 1;  i < 20; i++) {
		if(id < (1 << i)) break;
		c[id][i] = c[prev[c[id][i - 1]]][i - 1];
	}
}
void UndoCommands(int U) {
	++id; s.push_back('0');
	int x = id - U - 1;
	for(int i = 0; i < 20; i++) c[id][i] = c[x][i]; 
}
char GetLetter(int P) {
	int x = c[id][0];
	for(int i = 20 - 1; i >= 0; i--) {
		if((1 << i) < P) x = prev[c[id][i]], P -= 1 << i; 
	}
	return s[c[id][0]];
}

Compilation message (stderr)

scrivener.cpp: In function 'char GetLetter(int)':
scrivener.cpp:26:6: warning: variable 'x' set but not used [-Wunused-but-set-variable]
   26 |  int x = c[id][0];
      |      ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40