View Compilation Error

0_0_30457844_12843.cpp:14:11: error: size of array 'T' has non-integral type 'double'
 }T[2.5e6+5];
           ^
0_0_30457844_12843.cpp:16:9: error: 'o' does not name a type
 int n,m;o
         ^
0_0_30457844_12843.cpp: In function 'int main()':
0_0_30457844_12843.cpp:60:26: error: 'build' was not declared in this scope
         build(1,n,root[0]);
                          ^