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View Compilation Error

0_0_19201260_10418.cpp:9:1: error: 'vector' does not name a type
 vector<int>v[N];
 ^
0_0_19201260_10418.cpp: In function 'void dfs(int)':
0_0_19201260_10418.cpp:30:20: error: 'v' was not declared in this scope
     for(int i=0; i<v[s].size(); i++)
                    ^
0_0_19201260_10418.cpp:36:45: error: 'max' was not declared in this scope
         dp[s][0] += max(dp[ss][1], dp[ss][0]);
                                             ^
0_0_19201260_10418.cpp: In function 'bool ok(int, int)':
0_0_19201260_10418.cpp:43:31: error: 'memset' was not declared in this scope
     memset(vis, 0, sizeof(vis));
                               ^
0_0_19201260_10418.cpp:48:56: error: 'max' was not declared in this scope
         res += max( dp[ ct[i].y ][0], dp[ ct[i].y ][1] );
                                                        ^
0_0_19201260_10418.cpp: In function 'int main()':
0_0_19201260_10418.cpp:82:19: error: 'scanf' was not declared in this scope
     scanf("%d", &t);
                   ^
0_0_19201260_10418.cpp:86:29: error: 'v' was not declared in this scope
         for(i=1; i<=n; i++) v[i].clear();
                             ^
0_0_19201260_10418.cpp:87:35: error: 'memset' was not declared in this scope
         memset(cnt, 0, sizeof(cnt));
                                   ^
0_0_19201260_10418.cpp:90:26: error: 'sort' was not declared in this scope
         sort(ct+1, ct+1+c);
                          ^
0_0_19201260_10418.cpp:94:13: error: 'v' was not declared in this scope
             v[x].push_back(y);
             ^
0_0_19201260_10418.cpp:97:47: error: 'printf' was not declared in this scope
         printf("Case #%d: %d\n", ++tt, solve());
                                               ^


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