Submission #914378

#	Time	Username	Problem	Language	Result	Execution time	Memory
914378		VMaksimoski008	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	794 ms	86628 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;

int up[1000001][21], id=0, len[1000001];
char s[1000001];

void Init() { s[0] = ' '; }

void TypeLetter(char ch) {
    s[++id] = ch;
    len[id] = len[id-1] + 1;
    up[id][0] = id - 1;
    for(int i=1; i<21; i++) up[id][i] = up[ up[id][i-1] ][i-1];
}

void UndoCommands(int u) {
    int prev = (++id) - u - 1;
    s[id] = s[prev];
    len[id] = len[prev];
    up[id][0] = up[prev][0];
    for(int i=1; i<21; i++) up[id][i] = up[ up[id][i-1] ][i-1];
}

char GetLetter(int p) {
    int L = len[id]-p-1, pos = id;
    for(int i=20; i>=0; i--)
        if(L & (1 << i)) pos = up[pos][i];
	return s[pos];
}

Compilation message (stderr)

scrivener.cpp: In function 'char GetLetter(int)':
scrivener.cpp:26:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   26 |     for(int i=20; i>=0; i--)
      |     ^~~
scrivener.cpp:28:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   28 |  return s[pos];
      |  ^~~~~~

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