Submission #4026594

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define ln '\n'
#define REP(i, n) for(int i = 0; i < (int)(n); ++i)
#define FOR(i, a, b) for(int i = (a); i <= (int)(b); ++i)
#define FORR(i, a, b) for(int i = (a); i >= (int)(b); --i)
#define ALL(c) (c).begin(), (c).end()

typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VI> VVI;
typedef vector<VL> VVL;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;
typedef vector<P> VP;
typedef vector<PL> VPL;


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n, k;
    cin >> n >> k;
    VI t(n);
    REP(i, n) cin >> t[i];
    FOR(i, 2, n - 1) {
        int t_sum = 0;
        REP(j, 3) t_sum += t[i - j];
        if(t_sum < k) {
            cout << i + 1 << ln;
            return 0;
        }
    }
    cout << -1 << ln;
    return 0;
}

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