Submission #6003806

---

Source Code Expand

#include<cstdio>
#include<cstring>
#include<iostream>
using namespace std;
char s[100010];
int n;
int main(){
    scanf("%s",s);
    n=strlen(s);
    if(s[0]!='1'||s[n-1]!='0'){
        //cout<<"asd"<<endl;
        puts("-1");
        return 0;
    }
    for(int i=1;i<n-1;++i){
        if(s[n-i-1]!=s[i]){
            //cout<<i<<" asd"<<endl;
            //cout<<s[i]<<" "<<s[n-i]<<endl;
            puts("-1");
            return 0;
        }
    }
    for(int i=2,rt=1;i<=n;++i){
        printf("%d %d\n",rt,i);
        if(s[i-1]=='1')rt=i;
    }
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:8:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s",s);
                  ^

Judge Result