#include <iostream>
#include <cstdint>
#include <vector>
using namespace std;
vector<int> diameters; // D
vector<int> capacities; // C
vector<int> next_drain; // next higher, min D (like pointer)
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int N, Q;
cin >> N >> Q;
diameters = vector<int>(N+1, 0);
capacities = vector<int>(N+1, 0);
next_drain = vector<int>(N+1, -1);
{
int stack[N+2];
int ptr = 0;
for(int i=1; i<=N; i++) {
int d, c;
cin >> d >> c;
diameters[i] = d;
capacities[i] = c;
i--;
while(ptr && diameters[stack[ptr-1]] < d)
next_drain[stack[--ptr]] = i+1;
if(diameters[i] < d)
next_drain[i] = i+1;
else
stack[ptr++] = i;
i++;
}
}
while(Q--) {
int start, vol;
cin >> start >> vol;
while(start >= 0) {
vol -= capacities[start];
if(vol < 1)
break;
start = next_drain[start];
}
if(start == -1)
cout << "0\n";
else
cout << start << '\n';
}
return 0;
}
//6 5 4 10 6 8 3 5 4 14 10 9 4 20 1 25 6 30 5 8 3 13 2 8
