View Compilation Error

0_0_22253196_20056.cpp: In function 'int main(int, char**)':
0_0_22253196_20056.cpp:12:16: error: 's1' was not declared in this scope
    scanf("%d",&s1[i]);
                ^
0_0_22253196_20056.cpp:18:8: error: 's1' was not declared in this scope
     if(s1[i]!=s1[j])
        ^
0_0_22253196_20056.cpp:20:8: error: 's1' was not declared in this scope
     if(s1[i]<=s1[j])
        ^
0_0_22253196_20056.cpp:23:9: error: 's1' was not declared in this scope
     if((s1[i]-s1[j])!=s1[i]&&(s1[i]-s1[j])!=s1[j])
         ^