View Compilation Error

0_0_31185581_22480.cpp: In function 'int main()':
0_0_31185581_22480.cpp:20:9: error: 'vector' was not declared in this scope
         vector<int> dp(n), length(n);
         ^
0_0_31185581_22480.cpp:20:16: error: expected primary-expression before 'int'
         vector<int> dp(n), length(n);
                ^
0_0_31185581_22480.cpp:21:9: error: 'dp' was not declared in this scope
         dp[0] = nums[0]; length[0] = 1;
         ^
0_0_31185581_22480.cpp:21:26: error: 'length' was not declared in this scope
         dp[0] = nums[0]; length[0] = 1;
                          ^