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C.cpp
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C.cpp
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//#pragma GCC optimize "trapv"
#include<bits/stdc++.h>
#define ll long long int
#define fab(a,b,i) for(int i=a;i<b;i++)
#define pb push_back
#define db double
#define mp make_pair
//#define endl "\n"
#define f first
#define se second
#define all(x) x.begin(),x.end()
#define MOD 1000000007
#define vll vector<ll>
#define vi vector<int>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define quick ios_base::sync_with_stdio(false);cin.tie(NULL)
ll add(ll x, ll y) {ll res = x + y; return (res >= MOD ? res - MOD : res);}
ll mul(ll x, ll y) {ll res = x * y; return (res >= MOD ? res % MOD : res);}
ll sub(ll x, ll y) {ll res = x - y; return (res < 0 ? res + MOD : res);}
ll power(ll x, ll y) {ll res = 1; x %= MOD; while (y) {if (y & 1)res = mul(res, x); y >>= 1; x = mul(x, x);} return res;}
ll mod_inv(ll x) {return power(x, MOD - 2);}
using namespace std;
int main()
{ quick;
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
int t;
cin>>t;
while(t--)
{
int n,k;
cin>>n>>k;
string s;
cin>>s;
int cnt=0;
vector<pii > v;
int i=0;
while(cnt<k-1)
{
if(i&1)
{
int j=i;
while(j<n and s[j]!=')')
{
j++;
}
reverse(s.begin()+i,s.begin()+j+1);
v.pb({i,j});
cnt++;
}
else
{
int j=i;
while(j<n and s[j]!='(')
{
j++;
}
reverse(s.begin()+i,s.begin()+j+1);
v.pb({i,j});
}
i++;
}
while(i<n)
{
int j=i;
//cout<<"J:"<<j<<endl;
while(j<n and s[j]!='(')
{
j++;
}
if(j==n)
break;
reverse(s.begin()+i,s.begin()+j+1);
v.pb({i,j});
i++;
}
while(i<n)
{
int j=i;
while(j<n and s[j]!=')')
{
j++;
}
if(j==n)
break;
reverse(s.begin()+i,s.begin()+j+1);
v.pb({i,j});
i++;
}
//cout<<"S:"<<s<<endl;
cout<<v.size()<<endl;
for(auto j: v)
cout<<j.f+1<<" "<<j.se+1<<endl;
}
cerr << "time taken : " << (float)clock() / CLOCKS_PER_SEC << " secs" << endl;
return 0;
}