foo.cc: In function 'int main()':
foo.cc:17:6: warning: operation on 'lenP' may be undefined [-Wsequence-point]
   17 |    P[++lenP] = P[lenP - 1] + K[i] + S[P[lenP - 1]];
      |      ^~~~~~
foo.cc:17:6: warning: operation on 'lenP' may be undefined [-Wsequence-point]
foo.cc:17:6: warning: operation on 'lenP' may be undefined [-Wsequence-point]
foo.cc:17:6: warning: operation on 'lenP' may be undefined [-Wsequence-point]
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf("%d%d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~
foo.cc:9:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |  for (int i = 1; i <= n; i++)scanf("%d", &S[i]);
      |                              ~~~~~^~~~~~~~~~~~~
foo.cc:10:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |  for (int i = 1; i <= n; i++)scanf("%d", &T[i]);
      |                              ~~~~~^~~~~~~~~~~~~
foo.cc:12:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |   scanf("%d%d", &X[i], &K[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Found 20 testcases.