思路：按照下图所示连接

代码：

#pragma GCC optimize(2)#pragma GCC optimize(3)#pragma GCC optimize(4)#include
     
      using namespace std;#define fi first#define se second#define pi acos(-1.0)#define LL long long//#define mp make_pair#define pb push_back#define ls rt<<1, l, m#define rs rt<<1|1, m+1, r#define ULL unsigned LL#define pll pair
      
       #define pii pair
       
        #define piii pair
        
         #define mem(a, b) memset(a, b, sizeof(a))#define fio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);#define fopen freopen("in.txt", "r", stdin);freopen("out.txt", "w", stout);//headconst int N = 1e5 + 100;char s[N];bool vis[N];int main() {    scanf("%s", s);    int n = strlen(s);    for (int i = 0; i < n; i++) {        if(s[i] == '1') vis[i+1] = true;    }    if(vis[1] == 0 || vis[n-1] == 0 || vis[n] == 1) {        printf("-1\n");        return 0;    }    for (int i = 2; i < n-1; i++) {        if(vis[i] != vis[n-i]) {            printf("-1\n");            return 0;        }    }    stack
         
           st;    for (int i = 1; i <= n; i++) {        if(vis[i]) {            while(!st.empty()) printf("%d %d\n", st.top(), i), st.pop();        }        if(i != n)st.push(i);    }    while(!st.empty()) printf("%d %d\n", st.top(), n), st.pop();    return 0;}