Submission #1266291

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266291		wedonttalkanymore	Snowball (JOI21_ho_t2)	C++20	100 / 100	66 ms	11336 KiB

Main

#include <bits/stdc++.h>
/*
    Strat code: 
    - Thinking about how to solve the full problems: 15 min
    - Thinking about subtasks + code: 30 min
    - Stress: 10 - 15 min
    => Total need 2h15m
*/
using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 16;

int n, q;
int a[N];
int w[N];
int pos[N];
int pmin[N], pmax[N];
int ans[N];

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> n >> q;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= q; i++) cin >> w[i];
    for (int i = 1; i <= q; i++) pos[i] = pos[i - 1] + w[i];
    // for (int i = 1; i <= q; i++) cout << pos[i] << ' ';
    // cout  << '\n';
    for (int i = 1; i <= q; i++) {
        pmin[i] = min(pmin[i - 1], pos[i]); // ben trai
        pmax[i] = max(pmax[i - 1], pos[i]); // ben phai
        // cout << pmin[i] << ' ' << pmax[i] << '\n';
    }
    // if (n == 1) {
    //     cout << pmax[q] - pmin[q];
    //     return 0;
    // }
    ans[1] += abs(pmin[q]);
    ans[n] += pmax[q];
    // cout << ans[1] << ' ' << ans[n] << '\n';
    for (int i = 1; i < n; i++) {
        int dist = a[i + 1] - a[i];
        // cout << i << ' ' << dist << '\n';
        if (pmax[q] + abs(pmin[q]) <= dist) {
            ans[i] += pmax[q];
            ans[i + 1] += abs(pmin[q]);
        }
        else {
            int l = 1, r = q, res = 0;
            while(l <= r) {
                int mid = (l + r) / 2;
                if (pmax[mid] + abs(pmin[mid]) > dist) {
                    res = mid;
                    r = mid - 1;
                }
                else l = mid + 1;
            }
            // cout << res << '\n';
            if (pmax[res - 1] == pmax[res]) {
                ans[i] += pmax[res];
                ans[i + 1] += dist - pmax[res];
            }
            else {
                ans[i + 1] += abs(pmin[res]);
                ans[i] += dist - abs(pmin[res]);
            }
        }
    }
    for (int i = 1; i <= n; i++) cout << ans[i] << '\n';
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 33 / 33
• Subtask 2: 67 / 67