new file: P8218.cpp

P8218.cpp

@@ -0,0 +1,21 @@
+#include <cstdio>
+using namespace std;
+int n, m;
+int a[100005], pre[100005];
+int main()
+{
+    scanf("%d", &n);
+    for (int i = 1; i <= n; ++i)
+    {
+        scanf("%d", &a[i]);
+        pre[i] = a[i] + pre[i - 1];
+    }
+    scanf("%d", &m);
+    while (m--)
+    {
+        int l, r;
+        scanf("%d%d", &l, &r);
+        printf("%d\n", pre[r] - pre[l - 1]);
+    }
+    return 0;
+}