差分数组，前缀和

 1 /*************************************************************************
 2     > File Name: a.cpp
 3     > Author: QWX
 4     > Mail:
 5     > Created Time: 2018/11/11 9:43:08
 6  ************************************************************************/
 7
 8
 9 //{{{ #include
10 #include<iostream>
11 #include<cstdio>
12 #include<algorithm>
13 #include<vector>
14 #include<cmath>
15 #include<queue>
16 #include<map>
17 #include<set>
18 #include<string>
19 #include<cstring>
20 #include<complex>
21 #include<cassert>
22 //#include<bits/stdc++.h>
23 #define vi vector<int>
24 #define pii pair<int,int>
25 #define mp make_pair
26 #define pb push_back
27 #define fi first
28 #define se second
29 #define pw(x) (1ll << (x))
30 #define sz(x) ((int)(x).size())
31 #define all(x) (x).begin(),(x).end()
32 #define rep(i,l,r) for(int i=(l);i<(r);i++)
33 #define per(i,r,l) for(int i=(r);i>=(l);i--)
34 #define FOR(i,l,r) for(int i=(l);i<=(r);i++)
35 #define cl(a,b) memset(a,b,sizeof(a))
36 #define fastio ios::sync_with_stdio(false);cin.tie(0);
37 #define lson l , mid , ls
38 #define rson mid + 1 , r , rs
39 #define INF 0x3f3f3f3f
40 #define LINF 0x3f3f3f3f3f3f3f3f
41 #define ll long long
42 #define ull unsigned long long
43 #define dd(x) cout << #x << " = " << (x) << ","
44 #define de(x) cout << #x << " = " << (x) << "\n"
45 #define endl "\n"
46 using namespace std;
47 //}}}
48
49 const int N=1e5+7;
50 typedef int arr[N];
51 arr a,s,d,ans;
52 int main()
53 {
54     int n;scanf("%d",&n);
55     FOR(i,1,n)scanf("%d",&a[i]);
56     FOR(i,1,n)scanf("%d",&s[i]),s[i]+=s[i-1];
57     FOR(i,1,n){
58         int t=lower_bound(s+i,s+n+1,s[i-1]+a[i])-s;
59         if(t==i)ans[i]+=a[i];
60         else if(t==n+1)d[i]++;
61         else {
62             d[i]++,d[t]--,ans[t]+=a[i]-(s[t-1]-s[i-1]);
63         }
64     }
65     FOR(i,1,n)d[i]+=d[i-1],printf("%d%c",ans[i]+d[i]*(s[i]-s[i-1]),i==n?‘\n‘:‘ ‘);
66     return 0;
67 }

原文地址：https://www.cnblogs.com/klaycf/p/9953410.html