View Compilation Error

0_0_18108901_11788.cpp:25:1: error: 's' does not name a type
 s
 ^
0_0_18108901_11788.cpp: In function 'long long int China(long long int, long long int)':
0_0_18108901_11788.cpp:49:41: error: 'mult' was not declared in this scope
         ans = ((ans+mult(a[i]*Nn%M, x, M))%M + M) % M ;
                                         ^