コンパイルエラー

error[E0608]: cannot index into a value of type `usize`
  --> src/main.rs:41:30
   |
41 |                     next[v][c[u]] += dp[u][c[u]];
   |                              ^^^

error[E0608]: cannot index into a value of type `usize`
  --> src/main.rs:41:45
   |
41 |                     next[v][c[u]] += dp[u][c[u]];
   |                                             ^^^

For more information about this error, try `rustc --explain E0608`.
error: could not compile `Rust` (bin "Rust") due to 2 previous errors