Submission #1319437

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Source Code Expand

#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<stdlib.h>
#include<string.h>
#include<queue>
#define LL long long
using namespace std;
inline int read( )
{
  int sum=0;char c=getchar( );bool f=0;
  while(c<'0'||c>'9') {if(c=='-') f=1;c=getchar( );}
  while(c>='0'&&c<='9') {sum=sum*10+c-'0';c=getchar( );}
  if(f) return -sum;
  return sum;
}
const int N=500005;
int n,to[N][30],f[N][20];char s[N];
int main( )
{
  int i,j,l,r;
  scanf("%s",s+1);
  n=strlen(s+1);
  for(i=n;i>=1;i--)
    {
      to[i][s[i]-'a']=i+1;
      for(j=s[i]-'a'+1;j<=26;j++)
        to[i][j]=to[to[i][j-1]][j-1];
    }
  for(i=1;i<=n;i++) f[i][0]=to[i][26];
  for(j=1;j<=19;j++)
    for(i=1;i<=n;i++)
      f[i][j]=f[f[i][j-1]][j-1];
  int T=read( );
  while(T--)
    {
      l=read( );r=read( )+1;
      for(j=19;j>=0;j--)
	if(f[l][j]&&f[l][j]<=r) l=f[l][j];
      puts(l==r?"Yes":"No");
    }
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:22:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s",s+1);
                  ^

Judge Result