0_0_38490148_26519.cpp:100:6: error: 'N' was not declared in this scope
ll a[N];
^
0_0_38490148_26519.cpp: In function 'void solve()':
0_0_38490148_26519.cpp:105:41: error: 'a' was not declared in this scope
for (int i = 1; i <= n; ++i) cin >> a[i];
^
0_0_38490148_26519.cpp:107:21: error: 'a' was not declared in this scope
pst.build(1, n, a);
^
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