mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
#include"iostream"
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#include"cstdio"
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#include"cstring"
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using namespace std;
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const int N=1000010;
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int ltr[N<<2];
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char s[2][N];
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void build(int l,int r,int k)
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{
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if(l==r)
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{
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if(s[0][l]==s[1][l]) ltr[k]=1;
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else ltr[k]=0;
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return ;
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}
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int mid=(l+r)>>1;
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int l_son=k<<1;
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int r_son=l_son+1;
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build(l,mid,l_son);
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build(mid+1,r,r_son);
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ltr[k]=ltr[l_son];
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if(ltr[l_son]==mid-l+1) ltr[k]+=ltr[r_son];
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}
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void update(int l,int r,int z,int aim,char c,int k)
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{
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if(l==r)
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{
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s[z][aim]=c;
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ltr[k]=s[0][aim]==s[1][aim];
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return ;
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}
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int mid=(l+r)>>1;
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int l_son=k<<1;
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int r_son=l_son+1;
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if(aim<=mid)update(l,mid,z,aim,c,l_son);
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else update(mid+1,r,z,aim,c,r_son);
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ltr[k]=ltr[l_son];
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if(ltr[l_son]==mid-l+1) ltr[k]+=ltr[r_son];
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}
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int find(int l,int r,int aim,int k)
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{
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if(l==aim) return ltr[k];
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int mid=(l+r)>>1;
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int l_son=k<<1;
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int r_son=l_son+1;
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int ans;
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if(aim<=mid)
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{
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ans=find(l,mid,aim,l_son);
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if(ans==mid-aim+1) ans+=find(mid+1,r,mid+1,r_son);
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}
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else ans=find(mid+1,r,aim,r_son);
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return ans;
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}
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int main()
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{
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int T,Case;
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int i;
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int len,q;
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int x,a,b;
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char c[10];
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cin>>T;
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for(Case=1;Case<=T;Case++)
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{
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scanf("%s%s",s[0]+1,s[1]+1);
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i=1;
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while(s[0][i] && s[1][i]) i++;
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len=i-1;
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i=1;
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build(1,len,1);
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cin>>q;
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printf("Case %d:\n",Case);
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while(q--)
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{
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scanf("%d",&x);
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if(x==1)
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{
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scanf("%d%d%s",&a,&b,c);
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if(b+1>len) continue;
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update(1,len,a-1,b+1,c[0],1);
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}
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else
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{
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scanf("%d",&b);
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if(b+1>len) printf("0\n");
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else printf("%d\n",find(1,len,b+1,1));
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}
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}
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}
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return 0;
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}
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