B - Reverse Sort

https://codeforces.com/contest/1605/submission/135155141

CodeForces/1605/B/B.cpp

@@ -0,0 +1,32 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int t, n;
+string s;
+
+int main() {
+    cin >> t;
+    while (t--) {
+        cin >> n >> s;
+        if (is_sorted(s.begin(), s.end())) {
+            cout << 0 << endl;
+            continue;
+        }
+        int cnt = count(s.begin(), s.end(), '1');
+        s = ' ' + s;
+        vector<int> ans;
+        for (int i = 1; i <= n; i++) {
+            if (i < n - cnt + 1 && s[i] == '1' || i >= n - cnt + 1 && s[i] == '0') {
+                ans.push_back(i);
+            }
+        }
+        cout << 1 << endl;
+        cout << ans.size() << ' ';
+        for (int i : ans) {
+            cout << i << ' ';
+        }
+        cout << endl;
+    }
+    return 0;
+}