View Compilation Error

0_0_30669777_24114.cpp:69:1: error: 'mt25937' does not name a type
 mt25937 rnd(25250817);
 ^
0_0_30669777_24114.cpp: In function 'void work()':
0_0_30669777_24114.cpp:101:21: error: 'rnd' was not declared in this scope
     int p = int(rnd() % n) + 1;
                     ^