View Compilation Error

0_0_35902010_637.cpp: In function 'bool dfs(int)':
0_0_35902010_637.cpp:91:5: error: 'used' was not declared in this scope
     used[team(u)] = true;
     ^
0_0_35902010_637.cpp: In function 'int main()':
0_0_35902010_637.cpp:141:25: error: 'used' was not declared in this scope
                         used[team(p)] = false;
                         ^