View Compilation Error

0_0_38722532_14059.cpp: In function 'void solve()':
0_0_38722532_14059.cpp:50:65: error: invalid types 'long long int[long long int]' for array subscript
   50 |     while (m--) { int a, b, t; cin >> a >> b >> t; dis[a][b] = a[a][b] = t, cnt[a][b] = 1; }
      |                                                                 ^