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Submission #120472

# Submission time Handle Problem Language Result Execution time Memory
120472 2019-06-24T15:49:30 Z KieranHorgan Crayfish scrivener (IOI12_scrivener) C++17
Compilation error
 0 ms 0 KB 
#include <bits/stdc++.h>
using namespace std;

char charOfStep[1000005];
int depth[1000005];
int kthAncestor[1000005][21];
int curStep = 0;

void Init() {}

void TypeLetter(char L) {
	curStep++;
	charOfStep[curStep] = L;
	depth[curStep] = depth[curStep-1]+1;
	kthAncestor[curStep][0] = curStep-1;
	for(int i = 1; 1<<i <= depth[curStep]; i++)
		kthAncestor[curStep][i] = kthAncestor[kthAncestor[curStep][i-1]][i-1];
}

void UndoCommands(int U) {
	curStep++;
	charOfStep[curStep] = charOfStep[curStep-1-U];
	depth[curStep] = depth[curStep-1-U];
	kthAncestor[curStep] = kthAncestor[curStep-1-U];
}

char GetLetter(int P) {
  int node = curStep;
  for(int i = 21; i >= 0; i--)
  	if(depth[node] - (1<<i) >= P+1)
  		node = kthAncestor[node][i];
  return charOfStep[node];
}

Compilation message

scrivener.cpp: In function 'void UndoCommands(int)':
scrivener.cpp:24:48: error: invalid array assignment
  kthAncestor[curStep] = kthAncestor[curStep-1-U];
                                                ^