Codeforces Round #602 (Div. 2, based on Technocup 2020 Elimination Round 3) C Messy
//因为可以反转n次 所以可以得到任何可以构成的序列
#include<iostream>
#include<string>
#include<vector>
using namespace std ;
typedef pair<int,int>PII;
int n,k;
string s;
string get_str(int n,int k) {//先构建前k-1个
string res="";
for(int i=; i<k-; i++) {
res+="(";
res+=")";
}
int len=n-res.size();
for(int i=; i<len/; i++)
res+="(";//构建最后一个
for(int i=; i<len/; i++)
res+=")";
return res;
}
void solve_swap(int x,int y) {
while(x<y) {
swap(s[x],s[y]);
x++,y--;
}
}
void solve() {
cin>>n>>k;
cin>>s;
vector<PII>res;
string final_str=get_str(n,k);
for(int i=; i<n; i++) {
if(s[i]!=final_str[i]) {
for(int j=i+; j<n; j++) {
if(s[j]==final_str[i]) {
solve_swap(i,j);
res.push_back({i+,j+});
break;
}
}
}
}
cout<<res.size()<<endl;
for(int i=; i<res.size(); i++)
cout<<res[i].first<<" "<<res[i].second<<endl;
}
int main() {
int t;
cin>>t;
while(t--) solve();
return ;
}
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