View Compilation Error

0_0_32794198_9968.cpp:77:44: error: redefinition of 'std::mt19937 gen'
 mt19937 gen(chrono::high_resolution_clock::now().time_since_epoch().count());
                                            ^
0_0_32794198_9968.cpp:22:9: note: 'std::mt19937 gen' previously declared here
 mt19937 gen(chrono::high_resolution_clock::now().time_since_epoch().count());
         ^
0_0_32794198_9968.cpp: In function 'int main()':
0_0_32794198_9968.cpp:79:5: error: redefinition of 'int main()'
 int main() {
     ^
0_0_32794198_9968.cpp:24:5: note: 'int main()' previously defined here
 int main() {
     ^