Submission #120485

#	Time	Username	Problem	Language	Result	Execution time	Memory
120485		KieranHorgan	Crayfish scrivener (IOI12_scrivener)	C++17	0 / 100	1084 ms	64520 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
int a[1000005][23], curStep=0, node, i;
void Init() {}
void TypeLetter(char L) {
	a[++curStep][21] = L;
	a[curStep][22] = a[curStep-1][22]+1;
	a[curStep][0] = curStep-1;
	for(i = 1; 1<<i <= a[curStep][22]; i++)
		a[curStep][i] = a[a[curStep][i-1]][i-1];
}
void UndoCommands(int U) { copy(a[curStep-1-U], a[curStep-1-U]+23, a[++curStep]); }
char GetLetter(int P) {
  for(i = 21, node = curStep; a[node][22] != P+1;)
  		node = a[node][31-__builtin_clz(a[node][22]-P)];
  return a[node][21];
}

Compilation message (stderr)

scrivener.cpp: In function 'void UndoCommands(int)':
scrivener.cpp:12:70: warning: operation on 'curStep' may be undefined [-Wsequence-point]
 void UndoCommands(int U) { copy(a[curStep-1-U], a[curStep-1-U]+23, a[++curStep]); }
                                                                      ^~~~~~~~~
scrivener.cpp:12:70: warning: operation on 'curStep' may be undefined [-Wsequence-point]

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