View Compilation Error

0_0_15857758_12137.cpp:4:5: error: conflicting declaration 'int t'
 int t,n,i,j,sum,next[200005];
     ^
0_0_15857758_12137.cpp:3:6: note: previous declaration as 'char t [200005]'
 char t[200005];
      ^
0_0_15857758_12137.cpp: In function 'int main()':
0_0_15857758_12137.cpp:7:9: error: lvalue required as decrement operand
  while(t--){
         ^
0_0_15857758_12137.cpp:10:18: error: lvalue required as left operand of assignment
    if(-1==j||t[i]=t[j]) next[++i]==++j;
                  ^