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34 lines (28 loc) · 787 Bytes
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2202C1.cpp
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34 lines (28 loc) · 787 Bytes
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#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false); cin.tie(nullptr);
int t;
cin >> t;
while (t--) {
int n;
cin >> n;
vector<int> a(n);
for (int i = 0; i < n; i++) cin >> a[i];
stack<pair<int,bool>> st;
int count = 0;
for (int i = 0; i < n; i++) {
while (!st.empty() && !st.top().second && st.top().first >= a[i]) {
st.pop();
}
if (!st.empty() && st.top().first == a[i] - 1) {
st.push({a[i], false});
} else {
count++;
st.push({a[i], true});
}
}
cout << count << "\n";
}
return 0;
}