Submission #12680

#	Time	Username	Problem	Language	Result	Execution time	Memory
12680		gs14004	Crayfish scrivener (IOI12_scrivener)	C++98	5 / 100	1000 ms	12796 KiB

scrivener

int ops[1000005], prev[1000005], size[1000005], sz;

void Init(){
    
}

void TypeLetter(char L){
    ops[sz] = L;
    if(sz) size[sz] = size[prev[sz]]+1;
    else size[sz] = 1;
    sz++;
    prev[sz] = sz-1;
}

void UndoCommands(int U){
    prev[sz] = sz-U-1;
}

char GetLetter(int P){
    int i = prev[sz];
    int piv = size[i] - P - 1;
    while (piv) {
        i = prev[i];
        piv--;
    }
    return ops[i];
}

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