Submission #12674

#	Time	Username	Problem	Language	Result	Execution time	Memory
12674		gs14004	Crayfish scrivener (IOI12_scrivener)	C++98	0 / 100	1000 ms	13776 KiB

scrivener

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

void Init(){
    
}

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

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

char str[1000005];
char GetLetter(int P){
    int i = prev[sz];
    int piv = size[i] - P - 1;
    while (piv) {
        if(!ops[i]) piv++;
        i = prev[i];
    }
    while(!ops[i]) i = prev[i];
    return ops[i];
}

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