Submission #914375

#	Time	Username	Problem	Language	Result	Execution time	Memory
914375		VMaksimoski008	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	770 ms	91104 KiB

scrivener

#include <bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 21;
const int maxn = 1e6 + 5;
const double eps = 1e-9;

int up[maxn][LOG], id=0;
char s[maxn];
int len[maxn];

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<LOG; 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<LOG; 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=LOG-1; 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:51:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   51 |     for(int i=LOG-1; i>=0; i--)
      |     ^~~
scrivener.cpp:53:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   53 |  return s[pos];
      |  ^~~~~~

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