Complement

problem id:--http://practice.geeksforgeeks.org/problems/complement/0

code:--

#include <bits/stdc++.h>

using namespace std;
#define ll   long long
#define      pii               std::pair<int,int>
#define      vi                std::vector<int>
#define      vll               std::vector<long long>
#define      mp(a,b)           make_pair(a,b)
#define      pb(a)             push_back(a)
#define sc(x)   scanf("%d",&x)
#define sc2(x,y)   scanf("%d%d",&x,&y)
#define sc3(x,y,z)   scanf("%d%d%d",&x,&y,&z)
#define pf(x)   printf("%d\n",x);
#define      pf2(x,y)   printf("%d %d\n",x,y);
#define      each(it,s)        for(auto it = s.begin(); it != s.end(); ++it)
#define      rep(i, n)         for(int i = 0; i < (n); ++i)
#define      fill(a)           memset(a, 0, sizeof (a))
#define      sortA(v)          sort(v.begin(), v.end())
#define      sortD(v)          sort(v.begin(), v.end(), greater<auto>())
#define      X                 first
#define      Y                 second
#define debug(x) cerr<<"debug->"<<#x<<"::"<<x<<endl
#define debug2(x,y) cerr<<#x<<" :: "<<x<<"\t"<<#y<<" :: "<<y<<"\n"
#define debug3(x,y,z) cerr<<#x<<" :: "<<x<<"\t"<<#y<<" :: "<<y<<"\t"<<#z<<" :: "<<z<<"\n"

int main(int argc, char **argv) {
//std::ios::sync_with_stdio(false);
int t;
sc(t);
while(t--)
{
int n;
sc(n);
string str;
cin>>str;
int i=0,l=str.length();
int diff=0,maxdiff=0,x,y,fx,fy,zero=0;
while(str[i])
{
(str[i]=='1')? --diff:++diff,++zero;
//debug(diff);
if(diff==1 && zero==1 && str[i]=='0')  x=i,y=i;
else if(diff>=1) y=i;
else if(diff<0) diff=0,zero=0;
//debug2(x,y);
if(maxdiff<diff) fx=x,fy=y,maxdiff=diff;
++i;
}
if(maxdiff) { pf2(fx+1,fy+1); }
else
pf(-1);
}
return 0;
}