831C - Jury Marks - CodeForces Solution

brute force constructive algorithms *1700

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Python Code: 

o=lambda:[int(f)for f in input().split()]
k,n=o()
a=o()
b=o()
s=[]
for x in b:
    t=x
    t1=set()
    for y in a:
        t-=y
        t1.add(t)
    s+=[t1]
print(len(set.intersection(*s)))

C++ Code: 

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<int>;
using pii = pair<int, int>;

#define pb push_back
#define sz(x) (int)(x).size()
#define f first
#define s second
#define mp make_pair

const int INF = INT_MAX;
const int MOD = 1e9 + 7;

int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    int n, k;
    cin >> k >> n;
    vector<int> changes(k + 1), scores(n);
    for (int i = 1; i <= k; i++) {
        cin >> changes[i];
        changes[i] += changes[i - 1];
    }

    for (int &s: scores) cin >> s;

    set<int> start_pos;
    for (int i = 1; i <= k; i++) {
        start_pos.insert(scores[0] - changes[i]);
    }

    int ans = 0;
    for (int s: start_pos) {
        set<int> points;
        for (int i = 1; i <= k; i++) points.insert(s + changes[i]);

        bool valid = true;
        for (int sc: scores)
            valid &= points.count(sc);

        ans += valid;
    }

    cout << ans << "\n";

    return 0;
}


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