View Compilation Error

0_0_13461847_19136.cpp: In function 'int main()':
0_0_13461847_19136.cpp:12:14: error: 's' was not declared in this scope
   scanf("%s",s);
              ^
0_0_13461847_19136.cpp:26:8: error: 'v' was not declared in this scope
     if(v[i]=='?')
        ^
0_0_13461847_19136.cpp:33:8: error: 'p' was not declared in this scope
    for(p=n;;--p)
        ^
0_0_13461847_19136.cpp:37:11: error: 'p' was not declared in this scope
     if(i!=p&&v[i]!='?')
           ^
0_0_13461847_19136.cpp:37:14: error: 'v' was not declared in this scope
     if(i!=p&&v[i]!='?')
              ^