P5177 签到

https://www.luogu.com.cn/record/81665615

Luogu/P5177/P5177.cpp

@@ -0,0 +1,39 @@
+#include <iostream>
+#include <algorithm>
+#include <string>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int mod = 1e9 + 7;
+
+const int N = 70;
+
+int t;
+long long n, s[N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    for (int i = 1; i < 64; i++) {
+        long long x = ((1ll << i) - 1) % mod;
+
+        s[i] = (s[i - 1] + x * (x + 1) / 2) % mod;
+    }
+
+    cin >> t;
+
+    while (t--) {
+        cin >> n;
+
+        int x = 64 - __builtin_clzll(n) - 1;
+
+        n = (n - (1ll << x)) % mod;
+
+        cout << ((s[x - 1] << 1) % mod + n * (n + 1) % mod) % mod << endl;
+    }
+
+    return 0;
+}