Submission #306957

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
306957	2020-09-26 15:11:56	two_sides	Skyscraper (JOI16_skyscraper)	C++17	100 / 100	362 ms	173948 KiB

skyscraper

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int L = 1005;
const int N = 105;
const int MOD = 1e9 + 7;
int madd(int x, int y) {
    if ((x += y) >= MOD) x -= MOD;
    return x;
}
int mmul(int x, int y) {
    return ll(x) * y % MOD;
}
int n, l, dp[N][L][N][2][2], a[N];
int rec(int i, int tot,
int seg, int kl, int kr) {
    int nxt = tot + (seg * 2 + kl
    + kr) * abs(a[i + 1] - a[i]);
    if (nxt > l || seg < 0) return 0;
    if (i == n - 1) return seg == 0;
    int &res = dp[i][tot][seg][kl][kr];
    if (~res) return res;
    res = rec(i + 1, nxt, seg, 1, kr);
    res = madd(res,
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 80 / 80