tickets.cpp:2:31: error: 'std::vector' has not been declared
2 | long long find_maximum(int k, std::vector<std::vector<int>> x) {
| ^~~
tickets.cpp:2:42: error: expected ',' or '...' before '<' token
2 | long long find_maximum(int k, std::vector<std::vector<int>> x) {
| ^
tickets.cpp: In function 'long long int find_maximum(int, int)':
tickets.cpp:3:13: error: 'x' was not declared in this scope
3 | int n = x.size();
| ^
tickets.cpp:6:5: error: 'vector' was not declared in this scope
6 | vector<vector<int>> v(n, vector<int>(m));
| ^~~~~~
tickets.cpp:6:19: error: expected primary-expression before 'int'
6 | vector<vector<int>> v(n, vector<int>(m));
| ^~~
tickets.cpp:7:22: error: 'v' was not declared in this scope
7 | allocate_tickets(v);
| ^
tickets.cpp:7:5: error: 'allocate_tickets' was not declared in this scope
7 | allocate_tickets(v);
| ^~~~~~~~~~~~~~~~
tickets.cpp:9:12: error: expected primary-expression before 'int'
9 | vector<int> v2;
| ^~~
tickets.cpp:10:26: error: 'v2' was not declared in this scope
10 | for(int i=0;i<n;i++) v2.push_back(x[i][0]);
| ^~
tickets.cpp:12:5: error: 'll' was not declared in this scope
12 | ll ans = 0;
| ^~
tickets.cpp:13:28: error: 'ans' was not declared in this scope
13 | for(int i=0;i<n/2;i++) ans -= v2[i];
| ^~~
tickets.cpp:13:35: error: 'v2' was not declared in this scope
13 | for(int i=0;i<n/2;i++) ans -= v2[i];
| ^~
tickets.cpp:14:28: error: 'ans' was not declared in this scope
14 | for(int i=n/2;i<n;i++) ans += v2[i];
| ^~~
tickets.cpp:14:35: error: 'v2' was not declared in this scope
14 | for(int i=n/2;i<n;i++) ans += v2[i];
| ^~
tickets.cpp:16:12: error: 'ans' was not declared in this scope
16 | return ans;
| ^~~
tickets.cpp:4:9: warning: unused variable 'm' [-Wunused-variable]
4 | int m = x[0].size();
| ^