B - Irreducible Anagrams

https://codeforces.com/contest/1290/submission/177710968

Codeforces/1290/B/B.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+#include <algorithm>
+#include <string>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 2e5 + 5;
+
+int n, a[N][26];
+std::string s;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> s >> n;
+
+    s = ' ' + s;
+
+    for (int i = 1; i < s.size(); i++) {
+        std::copy_n(a[i - 1], 26, a[i]);
+
+        a[i][s[i] - 'a']++;
+    }
+
+    for (int i = 1, l, r; i <= n; i++) {
+        cin >> l >> r;
+
+        if (s[l] != s[r] || l == r) {
+            cout << "Yes" << endl;
+
+            continue;
+        }
+
+        int cnt = 0;
+        for (int i = 0; i < 26; i++) {
+            if (a[r][i] - a[l - 1][i] > 0) {
+                cnt++;
+            }
+        }
+
+        cout << (cnt < 3 ? "No" : "Yes") << endl;
+    }
+
+    return 0;
+}