View Compilation Error

0_0_17298753_15457.cpp: In function 'bool check(int)':
0_0_17298753_15457.cpp:22:9: error: 'i' was not declared in this scope
 int p=l[i]+r[i],y=r[i]-l[i];
         ^
0_0_17298753_15457.cpp:23:18: error: 'y' was not declared in this scope
     rep(i,1,m)if(y>S){
                  ^