answer.code:2:9: error: ISO C++ forbids declaration of ‘mint’ with no type [-fpermissive]
    2 |         mint(int _x = 0) : x(_x % P) { x < 0 ? x += P : 0; }
      |         ^~~~
answer.code: In function ‘int mint(int)’:
answer.code:2:28: error: only constructors take member initializers
    2 |         mint(int _x = 0) : x(_x % P) { x < 0 ? x += P : 0; }
      |                            ^
answer.code:2:35: error: ‘P’ was not declared in this scope
    2 |         mint(int _x = 0) : x(_x % P) { x < 0 ? x += P : 0; }
      |                                   ^
answer.code:2:53: error: ‘P’ was not declared in this scope
    2 |         mint(int _x = 0) : x(_x % P) { x < 0 ? x += P : 0; }
      |                                                     ^
answer.code:2:60: warning: no return statement in function returning non-void [-Wreturn-type]
    2 |         mint(int _x = 0) : x(_x % P) { x < 0 ? x += P : 0; }
      |                                                            ^
answer.code: At global scope:
answer.code:3:19: error: non-member function ‘int val()’ cannot have cv-qualifier
    3 |         int val() const { return x; }
      |                   ^~~~~
answer.code:5:9: error: ‘mint’ does not name a type; did you mean ‘int’?
    5 |         mint operator - () const {
      |         ^~~~
      |         int
answer.code:8:9: error: ‘mint’ does not name a type; did you mean ‘int’?
    8 |         mint inv() const {
      |         ^~~~
      |         int
answer.code:12:9: error: ‘mint’ does not name a type; did you mean ‘int’?
   12 |         mint &operator += (const mint &rhs) {
      |         ^~~~
      |         int
answer.code:16:9: error: ‘mint’ does not name a type; did you mean ‘int’?
   16 |         mint &operator -= (const mint &rhs) {
      |         ^~~~
      |         int
answer.code:20:9: error: ‘mint’ does not name a type; did you mean ‘int’?
   20 |         mint &operator *= (const mint &rhs) {
      |         ^~~~
      |         int
answer.code:24:9: error: ‘mint’ does not name a type; did you mean ‘int’?
   24 |         mint &operator /= (const mint &rhs) {
      |         ^~~~
      |         int
answer.code:27:9: error: ‘friend’ used outside of class
   27 |         friend mint operator + (const mint &lhs, const mint &rhs) {
      |         ^~~~~~
      |         ------
answer.code:27:16: error: ‘mint’ does not name a type; did you mean ‘int’?
   27 |         friend mint operator + (const mint &lhs, const mint &rhs) {
      |                ^~~~
      |                int
answer.code:31:9: error: ‘friend’ used outside of class
   31 |         friend mint operator - (const mint &lhs, const mint &rhs) {
      |         ^~~~~~
      |         ------
answer.code:31:16: error: ‘mint’ does not name a type; did you mean ‘int’?
   31 |         friend mint operator - (const mint &lhs, const mint &rhs) {
      |                ^~~~
      |                int
answer.code:35:9: error: ‘friend’ used outside of class
   35 |         friend mint operator * (const mint &lhs, const mint &rhs) {
      |         ^~~~~~
      |         ------
answer.code:35:16: error: ‘mint’ does not name a type; did you mean ‘int’?
   35 |         friend mint operator * (const mint &lhs, const mint &rhs) {
      |                ^~~~
      |                int
answer.code:39:9: error: ‘friend’ used outside of class
   39 |         friend mint operator / (const mint &lhs, const mint &rhs) {
      |         ^~~~~~
      |         ------
answer.code:39:16: error: ‘mint’ does not name a type; did you mean ‘int’?
   39 |         friend mint operator / (const mint &lhs, const mint &rhs) {
      |                ^~~~
      |                int
answer.code:44:9: error: ‘friend’ used outside of class
   44 |         friend ostream &operator << (ostream &os, const mint &a) {
      |         ^~~~~~
      |         ------
answer.code:44:16: error: ‘ostream’ does not name a type
   44 |         friend ostream &operator << (ostream &os, const mint &a) {
      |                ^~~~~~~
answer.code:47:1: error: expected declaration before ‘}’ token
   47 | };
      | ^
answer.code: In function ‘int main()’:
answer.code:50:9: error: ‘ios’ has not been declared
   50 |         ios::sync_with_stdio(0), cin.tie(0);
      |         ^~~
answer.code:50:34: error: ‘cin’ was not declared in this scope
   50 |         ios::sync_with_stdio(0), cin.tie(0);
      |                                  ^~~
answer.code:53:9: error: ‘vector’ was not declared in this scope
   53 |         vector<int> mask(n);
      |         ^~~~~~
answer.code:53:16: error: expected primary-expression before ‘int’
   53 |         vector<int> mask(n);
      |                ^~~
answer.code:55:17: error: ‘string’ was not declared in this scope
   55 |                 string s;
      |                 ^~~~~~
answer.code:56:24: error: ‘s’ was not declared in this scope
   56 |                 cin >> s;
      |                        ^
answer.code:59:33: error: ‘mask’ wa...