Submission #12681

#	Time	Username	Problem	Language	Result	Execution time	Memory
12681		gs14004	Crayfish scrivener (IOI12_scrivener)	C++98	12 / 100	0 ms	1088 KiB

scrivener

int ops[105], prev[105][20], size[105], sz;

void Init(){
    
}

void TypeLetter(char L){
    ops[sz] = L;
    if(sz) prev[sz][0] = sz-1;
    for (int i=1; i<20; i++) {
        prev[sz][i] = prev[prev[sz][i-1]][i-1];
    }
    size[sz] = size[prev[sz][0]]+1;
    sz++;
}

void UndoCommands(int U){
    prev[sz][0] = sz-U-1;
    for (int i=1; i<20; i++) {
        prev[sz][i] = prev[prev[sz][i-1]][i-1];
    }
    size[sz] = size[prev[sz][0]];
    sz++;
}

char GetLetter(int P){
    int pos = sz-1;
    int obj = P+1;
    for (int i=19; i>=0; i--) {
        if(size[prev[pos][i]] >= obj){
            pos = prev[pos][i];
        }
    }
    return ops[pos];
}

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