Submission #189074

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
189074	2020-01-13T15:44:48 Z	AQT	Crayfish scrivener (IOI12_scrivener)	C++14	Compilation error	0 ms	0 KB

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 add(int idx){
    for(int d = 1; d<20; d++){
        tbl[d][idx] = tbl[d-1][tbl[d-1][idx]];
    }
}

void TypeLetter(char c){
    arr[++idx] = {crnt, arr[crnt].len+1, c};
    tbl[0][idx] = crnt;
    add(idx);
    crnt = idx;
}

void UndoCommands(int u){
    int k = crnt;
    while(u--){
        crnt = arr[crnt].p;
    }
    arr[++idx] = arr[crnt];
    arr[idx].p = k;
    add(idx);
    crnt = idx;
}

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;
}

int main(){
    Init();
    TypeLetter('a');
    TypeLetter('b');
    cout << GetLetter(1) << endl;
    TypeLetter('d');
    UndoCommands(2);
    UndoCommands(1);
    cout << GetLetter(2) << endl;
    TypeLetter('e');
    UndoCommands(1);
    UndoCommands(5);
    TypeLetter('c');
    cout << GetLetter(2) << endl;
    UndoCommands(2);
    cout << GetLetter(2) << endl;
}

Compilation message

/tmp/ccQJgOS4.o: In function `main':
scrivener.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cc4uI461.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status