Submission #189068

#	Time	Username	Problem	Language	Result	Execution time	Memory
189068		AQT	Crayfish scrivener (IOI12_scrivener)	C++14	12 / 100	1041 ms	17492 KiB

scrivener

#include <bits/stdc++.h>

using namespace std;

struct node{
    int p;
    int len;
    char c;
};

node arr[1000005];
int crnt = 0, idx = 0;
int tbl[20][1000005];

void Init(){
    arr[0] = {-1, 0, ' '};
}

void TypeLetter(char c){
    arr[++idx] = {crnt, arr[crnt].len+1, c};
    tbl[0][idx] = crnt;
    for(int d = 1; d<20; d++){
        tbl[d][idx] = tbl[d-1][tbl[d-1][idx]];
    }
    crnt = idx;
}

void UndoCommands(int u){
    int temp = crnt;
    while(u--){
        crnt = arr[crnt].p;
    }
}

char GetLetter(int p){
    int t = crnt;
    p++;
    for(int d = 19; d>=0; d--){
        if(arr[tbl[d][t]].len >= p){
            t = tbl[d][t];
        }
    }
    return arr[t].c;
}

Compilation message (stderr)

scrivener.cpp: In function 'void UndoCommands(int)':
scrivener.cpp:29:9: warning: unused variable 'temp' [-Wunused-variable]
     int temp = crnt;
         ^~~~

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