제출 #242005

#제출 시각아이디문제언어결과실행 시간메모리
242005alexandra_udristoiu크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++14
100 / 100
590 ms90616 KiB
int nr; int d[20][1000003], pos[1000003], num[1000003]; char s[1000003]; void Init() {} void TypeLetter(char c) { nr++; s[nr] = c; pos[nr] = nr; num[nr] = 1 + num[nr - 1]; d[0][nr] = pos[nr - 1]; for(int ii = 1; ii < 20; ii++){ d[ii][nr] = d[ii - 1][ d[ii - 1][nr] ]; } } void UndoCommands(int x){ nr++; pos[nr] = pos[nr - x - 1]; num[nr] = num[nr - x - 1]; for(int ii = 0; ii < 20; ii++){ d[ii][nr] = d[ii][ pos[nr] ]; } } char GetLetter(int p) { int ii, x = pos[nr]; p = num[nr] - p - 1; for(ii = 19; ii >= 0; ii--){ if(p >= (1 << ii) ){ x = d[ii][x]; p -= (1 << ii); } } return s[x]; }
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