Submission #370504

#	Time	Username	Problem	Language	Result	Execution time	Memory
370504		ijxjdjd	Crayfish scrivener (IOI12_scrivener)	C++14	Compilation error	0 ms	0 KiB

scrivener

#include <bits/stdc++.h>
#define FR(i, N) for (int i = 0; i < int(N); i++)
#define all(x) begin(x), end(x)

using namespace std;

using ll = long long;

const int MAXN = (int)(1e6) + 5;
const int MAXK = 21;

int up[MAXN][MAXK];
int undo[MAXN][MAXK];
int depth[MAXN];
char res[MAXN];
int cnt = 1;
int liftUp(int u, int d) {
    for (int i = 0; i < MAXK; i++) {
        if (d&(1<<i)) {
            u = up[u][i];
        }
    }
    return u;
}
int liftUndo(int u, int d) {
    for (int i = 0; i < MAXK; i++) {
        if (d&(1<<i)) {
            u = undo[u][i];
        }
    }
    return u;
}
void Init() {

}

void TypeLetter(char L) {
    res[cnt] = L;
    up[cnt][0] = cnt-1;
    undo[cnt][0] = cnt-1;
    for (int i = 1; i < MAXK; i++) {
        up[cnt][i] = up[up[cnt][i-1]][i-1];
        undo[cnt][i] = undo[undo[cnt][i-1]][i-1];
    }
    depth[cnt] = depth[cnt-1]+1;
    cnt++;
}

void UndoCommands(int U) {
    int next = liftUndo(cnt-1, U);
    res[cnt] = res[next];
    up[cnt][0] = up[next][0];
    undo[cnt][0] = cnt-1;
    for (int i = 1; i < MAXK; i++) {
        up[cnt][i] = up[up[cnt][i-1]][i-1];
        undo[cnt][i] = undo[undo[cnt][i-1]][i-1];
    }
    depth[cnt] = depth[next];
}
char GetLetter(int P) {
    return  res[liftUp(cnt-1, depth[cnt-1] - P - 1)];
}
int main() {
  Init();

  int cmd_num, tmp;
  tmp = scanf("%d", &cmd_num);

  int i;
  for (i = 0; i < cmd_num; i++) {
    char cmd;
    int tmp = scanf(" %c", &cmd);
    if (cmd == 'T') {
      char letter;
      tmp = scanf(" %c", &letter);
      TypeLetter(letter);
    }
    else if (cmd == 'U') {
      int number;
      tmp = scanf("%d", &number);
      UndoCommands(number);
    }
    else if (cmd == 'P') {
      int index;
      char letter;
      tmp = scanf("%d", &index);
      letter = GetLetter(index);
      printf("%c\n", letter);
    }
  }

  puts("Let's test for cheating!!");

  return 0;

}

Compilation message (stderr)

scrivener.cpp: In function 'int main()':
scrivener.cpp:72:9: warning: variable 'tmp' set but not used [-Wunused-but-set-variable]
   72 |     int tmp = scanf(" %c", &cmd);
      |         ^~~
scrivener.cpp:66:16: warning: variable 'tmp' set but not used [-Wunused-but-set-variable]
   66 |   int cmd_num, tmp;
      |                ^~~
/tmp/ccbQRitC.o: In function `main':
scrivener.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cciC7RMu.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status