64 lines
1.3 KiB
C++
64 lines
1.3 KiB
C++
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#include <bits/stdc++.h>
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using namespace std;
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#ifdef ONLINE_JUDGE
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#define dbg(...)
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#else
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#include "Assets/debug.h"
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#endif
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#define int long long
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#define ll long long
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#define endl '\n'
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#define ff first
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#define ss second
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#define ins insert
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#define pb push_back
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#define ppb pop_back
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#define sz(x) (int)(x).size()
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#define all(x) x.begin(), x.end()
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#define rep(i,a,b) for(int i=a; i<b; ++i)
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#define rrep(i,a,b) for(int i=a; i>=b; --i)
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#define yn(f) f? cout<<"YES\n":cout<<"NO\n"
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#define FAST (ios_base::sync_with_stdio(false), cin.tie(nullptr));
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ll pow(ll x,ll y,ll m=1e9+7) {ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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int n,q;
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cin>>n>>q;
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string a,b;
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cin>>a>>b;
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vector<int>cnt(26,0);
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vector<vector<int>>v;
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v.pb(cnt);
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for(int i=0; i<n; ++i)
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{
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cnt[a[i]-'a']++;
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cnt[b[i]-'a']--;
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v.pb(cnt);
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}
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dbg(v);
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while(q--)
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{
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int l,r;
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cin>>l>>r;
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int op=0;
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dbg(v[l-1],v[r]);
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for(int i=0; i<26; ++i)
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{
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op += abs(v[l-1][i]-v[r][i]);
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}
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cout<<op/2<<endl;
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}
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}
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signed main()
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{
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FAST;
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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}
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