SONG C++

#include <bits/stdc++.h>
using namespace std;
int m,n,a,s[100001];
/*void bs_de_quy(int l,int r)
{
    if (l>r) return;
    int mid=(l+r)/2;
    if (s[mid-1]<a && a<=s[mid])
    {
        printf("%d\n",mid);
        return;
    }
    if (a>s[mid]) bs(mid+1,r);
    else bs(l,mid-1);
}*/

int bs(int x, int l,int r)
{
    int mid=0;
    while(l<=r)
    {
        mid=(l+r)/2;
        if (s[mid-1]<x && x<=s[mid])
            return mid;
        if (x>s[mid]) l=mid+1;
        else r=mid-1;
    }
    return mid;
}

void nhap()
{
    int c,t;
    scanf("%d%d\n",&n,&m);
    s[0]=0;
    for (int i=1;i<=n;i++)
    {
        scanf("%d%d\n",&c,&t);
        s[i]=s[i-1]+c*t;
    }
}

void giai()
{
    int x,res;
    //for(int i=1;i<=n;i++) cout<<s[i]<<" ";
    //cout<<endl;
    for (int i=1;i<=m;i++)
    {
        scanf("%d",&x);
        res=bs(x,1,n);
        cout<<res<<endl;
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    freopen("song.inp","r",stdin);
    freopen("song.out","w",stdout);
    nhap();
    giai();
}