Submission #1192686

---

Source Code Expand

#include <cstdio>
#include <cstring>
#define IL inline
#define N 500007
#define K 20
#define REP(a,b,c) for(a=b;a<=c;a++)
using namespace std;
char s[N];
int f[N][27],fa[K][N];
IL int rd(){
	int res=0;char c;while((c=getchar())<'0'||c>'9');
	while(c>='0'&&c<='9')res=res*10+c-'0',c=getchar();return res;
}
int main(){
  scanf("%s",s+1);int n=strlen(s+1),q,i,j,c;
	for(i=n;i;i--){
		c=s[i]-'a';f[i][c]=i+1;
		for(j=c+1;j<=26;j++)f[i][j]=f[f[i][j-1]][j-1];
		for(j=c-1,c=fa[0][i]=f[i][26];j>=0;j--)f[i][j]=f[c][j];
	}
	for(j=1;j<K;j++)
		REP(i,1,n)fa[j][i]=fa[j-1][fa[j-1][i]];
	q=rd();
	while(q--){
		i=rd(),j=rd()+1;
		for(c=K-1;c>=0;c--)
			if(fa[c][i]&&fa[c][i]<=j)i=fa[c][i];
		puts(i==j?"Yes":"No");
	}
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:15:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s",s+1);int n=strlen(s+1),q,i,j,c;
                  ^

Judge Result