View Compilation Error

0_0_30669782_6064.cpp:69:1: error: 'mt13937' does not name a type
 mt13937 rnd(13130817);
 ^
0_0_30669782_6064.cpp: In function 'void work()':
0_0_30669782_6064.cpp:101:21: error: 'rnd' was not declared in this scope
     int p = int(rnd() % n) + 1;
                     ^