제출 #20810

#제출 시각아이디문제언어결과실행 시간메모리
20810jjwdi0크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++11
60 / 100
1000 ms96352 KiB
int par[1<<20][21], size[1<<20], for_undo[1<<20], kth, Q; char a[1<<20]; void Init(){} void TypeLetter(char x) { for_undo[kth] = kth; if(kth) par[kth][0] = for_undo[kth - 1]; for(int i = 1; par[kth][i-1]; i++) { par[kth][i] = par[par[kth][i-1]][i-1]; } a[kth] = x, size[kth] = size[par[kth][0]] + 1, kth++; } void UndoCommands(int x) { for_undo[kth] = for_undo[kth - x - 1]; kth++; } char GetLetter(int x) { int u = for_undo[kth - 1]; for(int i = 19; i + 1; i--) { if(size[par[u][i]] > x) u = par[u][i]; } return a[u]; }
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