68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
#include<cstdio>
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#include<cstring>
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#include<map>
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#include<string>
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#include<algorithm>
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using namespace std;
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typedef long long ll;
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map<string,int> match;
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char s[100010][20];
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int n,m,point[100010],one[100010],two[100010],sum_one[100010],sum_two[100010];
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bool cmp(char a,char b)
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{
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return a<b;
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}
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int main()
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{
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int i,j,k,a,b,len,c,pos;
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ll l,r,ans;
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while(~scanf("%d%d",&n,&m))
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{
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for(i=1;i<=n;i++)
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scanf("%s",s[i]);
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match.clear();
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for(i=n;i>=1;i--)
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{
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len=strlen(s[i]);
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sort(s[i],s[i]+len,cmp);
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k=match[s[i]];
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if(k==0)
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point[i]=n+1;
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else
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point[i]=k;
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match[s[i]]=i;
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}
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a=n+1;b=n+1;
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for(i=n;i>=1;i--)
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{
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c=point[i];
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if(c<a)
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b=a,a=c;
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else if(c<b)
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b=c;
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one[i]=a;
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two[i]=b;
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}
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for(i=1;i<=n;i++)
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{
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sum_one[i]=sum_one[i-1]+(one[i]-1);
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sum_two[i]=sum_two[i-1]+(two[i]-1);
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}
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ans=0;
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while(m--)
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{
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scanf("%I64d%I64d",&l,&r);
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l+=ans;
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r-=ans;
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ans=0;
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pos=upper_bound(one+1,one+n,r)-one-1;
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if(pos>=l)
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ans+=r*(pos-l+1)-(sum_one[pos]-sum_one[l-1]);
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pos=upper_bound(two+1,two+n,r)-two-1;
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if(pos>=l)
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ans-=r*(pos-l+1)-(sum_two[pos]-sum_two[l-1]);
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printf("%I64d\n",ans);
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}
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}
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}
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