View Compilation Error

0_0_23032036_5385.cpp: In function 'int main()':
0_0_23032036_5385.cpp:15:19: error: 'n' was not declared in this scope
     scanf("%d%d",&n,&m);
                   ^
0_0_23032036_5385.cpp:17:29: error: 'bridge' was not declared in this scope
     for(int i=0;i<=n;i++)   bridge[i].clear();
                             ^
0_0_23032036_5385.cpp:19:12: error: 'pro' was not declared in this scope
     memset(pro,0,sizeof(pro));
            ^
0_0_23032036_5385.cpp:24:9: error: 'bridge' was not declared in this scope
         bridge[a].push_back(b);
         ^
0_0_23032036_5385.cpp:40:27: error: 'bridge' was not declared in this scope
             for(int i=0;i<bridge[u].size();++i)
                           ^