new file: P7167.cpp

P7167.cpp

@@ -0,0 +1,56 @@
+#include <cstdio>
+#include <stack>
+using namespace std;
+int n, q;
+struct node
+{
+    int d, c;
+} p[100005];
+int nxt[100005][20];
+long long sum[100005][20];
+int main()
+{
+    scanf("%d%d", &n, &q);
+    for (int i = 1; i <= n; ++i)
+    {
+        scanf("%d%d", &p[i].d, &p[i].c);
+        sum[i][0] = p[i].c;
+    }
+    stack<pair<int, int>> s;
+    nxt[n][0] = 0;
+    s.push({p[n].d, n});
+    for (int i = n - 1; i >= 1; --i)
+    {
+        while (!s.empty() && s.top().first <= p[i].d)
+            s.pop();
+        if (s.empty())
+            nxt[i][0] = 0;
+        else
+            nxt[i][0] = s.top().second;
+        s.push({p[i].d, i});
+    }
+    for (int k = 1; k <= 18; ++k)
+    {
+        for (int i = 1; i <= n; ++i)
+        {
+            nxt[i][k] = nxt[nxt[i][k - 1]][k - 1];
+            sum[i][k] = sum[i][k - 1] + sum[nxt[i][k - 1]][k - 1];
+        }
+    }
+    while (q--)
+    {
+        int r;
+        long long v;
+        scanf("%d%lld", &r, &v);
+        for (int k = 18; k >= 0; --k)
+        {
+            if (sum[r][k] < v)
+            {
+                v -= sum[r][k];
+                r = nxt[r][k];
+            }
+        }
+        printf("%d\n", r);
+    }
+    return 0;
+}