oj.uz

답안 #932391

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
932391 2024-02-23T09:15:18 Z thangdz2k7 Sjeckanje (COCI21_sjeckanje) C++17
55 / 110
 2000 ms 22764 KB 
#include <bits/stdc++.h>
#define ll long long

using namespace std;

const int N = 2e5 + 5;

int n, q;
ll d[N], a[N];

ll it[4 * N][2][2];

ll all(int s){
    ll ans = 0;
    for (int i = 0; i <= 1; ++ i){
        for (int j = 0; j <= 1; ++ j) ans = max(ans, it[s][i][j]);
    }
    return ans;
}

bool trai(ll a, ll b){
    return (a == 0 || b == 0 || (a > 0 && b < 0) || (a < 0 && b > 0));
}

void mer(int s, int mid){
    for (int i = 0; i <= 1; ++ i){
        for (int j = 0; j <= 1; ++ j) it[s][i][j] = 0;
    }
    for (int i = 0; i <= 1; ++ i){
        for (int j = 0; j <= 1; ++ j){
            for (int u = 0; u <= 1; ++ u){
                if (u & j && trai(d[mid], d[mid + 1])) continue;
                for (int v = 0; v <= 1; ++ v){
                    it[s][i][v] = max(it[s][i][v], it[2 * s][i][j] + it[2 * s + 1][u][v]);
                }
            }
        }
    }
}

void build(int s, int l, int r){
    if (l == r){
        it[s][1][1] = abs(d[l]);
        return;
    }

    int mid = l + r >> 1;
    build(2 * s, l, mid);
    build(2 * s + 1, mid + 1, r);
    mer(s, mid);
}

void upd(int s, int l, int r, int u){
    if (l == r){
        it[s][1][1] = abs(d[l]);
        return;
    }

    int mid = l + r >> 1;
    if (mid >= u) build(2 * s, l, mid);
    else build(2 * s + 1, mid + 1, r);
    mer(s, mid);
}

void solve(){
    cin >> n >> q;
    for (int i = 1; i <= n; ++ i) {
        cin >> a[i];
        if (i > 1) d[i - 1] = a[i] - a[i - 1];
    }
    build(1, 1, n - 1);

    while (q --){
        int l, r, x;
        cin >> l >> r >> x;
        if (l > 1) {
            d[l - 1] += x;
            upd(1, 1, n - 1, l - 1);
        }
        if (r < n) {
            d[r] -= x;
            upd(1, 1, n - 1, r);
        }
        cout << all(1) << '\n';
    }

}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    solve();

    return 0;
}

Compilation message

Main.cpp: In function 'void build(int, int, int)':
Main.cpp:47:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |     int mid = l + r >> 1;
      |               ~~^~~
Main.cpp: In function 'void upd(int, int, int, int)':
Main.cpp:59:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   59 |     int mid = l + r >> 1;
      |               ~~^~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2392 KB Output is correct
2 Correct 2 ms 2392 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2396 KB Output is correct
5 Correct 3 ms 2396 KB Output is correct
6 Correct 2 ms 2392 KB Output is correct

Subtask #2
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2392 KB Output is correct
2 Correct 2 ms 2392 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2396 KB Output is correct
5 Correct 3 ms 2396 KB Output is correct
6 Correct 2 ms 2392 KB Output is correct
7 Correct 220 ms 4700 KB Output is correct
8 Correct 262 ms 4840 KB Output is correct
9 Correct 227 ms 4840 KB Output is correct
10 Correct 235 ms 4700 KB Output is correct
11 Correct 231 ms 4840 KB Output is correct
12 Correct 172 ms 4840 KB Output is correct

Subtask #3
0 / 55.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2392 KB Output is correct
2 Correct 2 ms 2392 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2396 KB Output is correct
5 Correct 3 ms 2396 KB Output is correct
6 Correct 2 ms 2392 KB Output is correct
7 Correct 220 ms 4700 KB Output is correct
8 Correct 262 ms 4840 KB Output is correct
9 Correct 227 ms 4840 KB Output is correct
10 Correct 235 ms 4700 KB Output is correct
11 Correct 231 ms 4840 KB Output is correct
12 Correct 172 ms 4840 KB Output is correct
13 Execution timed out 2040 ms 22764 KB Time limit exceeded
14 Halted 0 ms 0 KB -