Submission #310889

#	Time	Username	Problem	Language	Result	Execution time	Memory
310889		juggernaut	Crayfish scrivener (IOI12_scrivener)	C++14	5 / 100	390 ms	51704 KiB

scrivener

#include<bits/stdc++.h>
using namespace std;
int up[1000005][20],depth[1000005],pos[1000005],timer,tmp,v,i;
char res[1000005];
void Init(){}
void TypeLetter(char ch){
    res[++v]=ch;
	up[v][0]=tmp;
	depth[v]=depth[tmp]+1;
	tmp=v;
	pos[++timer]=tmp;
	for(i=1;i<20;i++)up[tmp][i]=up[up[tmp][i-1]][i-1];
}
void UndoCommands(int num){
    pos[++timer]=tmp=pos[timer-1-num];
}
char GetLetter(int p){
    p++;
    int to=tmp;
    for(i=19;i>=0;i--)if(depth[up[to][i]]>=p)to=up[to][i];
    return res[to];
}

Compilation message (stderr)

scrivener.cpp: In function 'void UndoCommands(int)':
scrivener.cpp:15:9: warning: operation on 'timer' may be undefined [-Wsequence-point]
   15 |     pos[++timer]=tmp=pos[timer-1-num];
      |         ^~~~~~~
scrivener.cpp:15:9: warning: operation on 'timer' may be undefined [-Wsequence-point]

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