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| #include <iostream>
#include <algorithm>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<stack>
#include<string>
#include<vector>
#define ll long long
using namespace std;
const int N = 300000 + 9;
typedef pair<int, int> PII;
int n, m;
int a[N], s[N];
vector<int> alls;
vector<PII> add, query;
int find(int x)
{
int l = 0, r = alls.size() - 1;
while (l < r)
{
int mid = l + r >> 1;
if (alls[mid] >= x) r = mid;
else l = mid + 1;
}
return r + 1;
}
vector<int>::iterator unique(vector<int> &a)
{
int j = 0;
for (int i = 0; i < a.size(); i ++ )
if (!i || a[i] != a[i - 1])
a[j ++ ] = a[i];
return a.begin() + j;
}
int main()
{
int n, m;
cin >> n >> m;
for (int i = 0; i < n; i++)
{
int x, c;
scanf("%d%d", &x, &c);
add.push_back({ x,c });
alls.push_back(x);
}
for (int i = 0; i < m; i++)
{
int l, r;
scanf("%d%d", &l, &r);
query.push_back({ l,r });
alls.push_back(l);
alls.push_back(r);
}
sort(alls.begin(), alls.end());
alls.erase(unique(alls), alls.end());
for (auto item : add)
{
int x = find(item.first);
a[x] += item.second;
}
for (int i = 1; i <= alls.size(); i++)
{
s[i] = s[i - 1] + a[i];
}
for (auto item:query)
{
int l = find(item.first), r = find(item.second);
cout << s[r] - s[l - 1] << endl;
}
return 0;
}
|
