Submission #974405

#	Time	Username	Problem	Language	Result	Execution time	Memory
974405		lucri	Crayfish scrivener (IOI12_scrivener)	C++17	Compilation error	0 ms	0 KiB

scrivener

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>

#define inbuf_len 1 << 16
#define outbuf_len 1 << 16

#include<bits/stdc++.h>
std::string ans[1000010];
int nr;
void Init()
{
    return;
}
void TypeLetter(char L)
{
    ++nr;
    ans[nr]=ans[nr-1];
    ans[nr]+=L;
}
void UndoCommands(int U)
{
    ++nr;
    ans[nr]=ans[nr-U-1];
}
char GetLetter(int P)
{
    return ans[nr][P];
}

int main() {
  Init();

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

  int i;
  for (i = 0; i < cmd_num; i++) {
    char cmd;
    scanf(" %c", &cmd);
    if (cmd == 'T') {
      char letter;
      scanf(" %c", &letter);
      TypeLetter(letter);
    }
    else if (cmd == 'U') {
      int number;
      scanf("%d", &number);
      UndoCommands(number);
    }
    else if (cmd == 'P') {
      int index;
      char letter;
      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:36:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |   scanf("%d", &cmd_num);
      |   ~~~~~^~~~~~~~~~~~~~~~
scrivener.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |     scanf(" %c", &cmd);
      |     ~~~~~^~~~~~~~~~~~~
scrivener.cpp:44:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |       scanf(" %c", &letter);
      |       ~~~~~^~~~~~~~~~~~~~~~
scrivener.cpp:49:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |       scanf("%d", &number);
      |       ~~~~~^~~~~~~~~~~~~~~
scrivener.cpp:55:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |       scanf("%d", &index);
      |       ~~~~~^~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccprKZMt.o: in function `main':
scrivener.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc2tirZs.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status