oj.uz

답안 #990071

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
990071 2024-05-29T13:11:37 Z HuyAT Sjeckanje (COCI21_sjeckanje) C++14
55 / 110
 2000 ms 10300 KB 
#include<bits/stdc++.h>
#define newl '\n'

const int N = 2e5 + 10;
const int V = 1e7 + 10;
const long long INF = 1e18;
const long long M = 1e9 + 7;

long long a[N + 1],b[N + 1];
int n,q;
long long diff[N + 1],f[N + 1];

void readData(){
    std::cin >> n >> q;
    for(int i = 1;i <= n;++i){
        std::cin >> a[i];
        if(i > 1){
            diff[i - 1] = a[i] - a[i - 1];
        }
    }
}
long long calc(){
    std::vector<long long> b;
    b.emplace_back(0);
    b.emplace_back(a[1]);
    int it = 2;
    for(int i = 2;i < n;++i){
        if((a[i - 1] <= a[i]) != (a[i] <= a[i + 1])){
//            std::cerr << i << newl;4
            it = std::max(it,i - 1);
            while(it <= std::min(n,i + 1)){
                b.emplace_back(a[it]);
                ++it;
            }
        }
    }
    it = std::max(it,n);
    while(it <= n){
        b.emplace_back(a[it++]);
    }
//    for(int val : b){
//        std::cout << val << " ";
//    }
//    std::cout << newl;
    for(int i = 1;i < (int)b.size();++i){
        f[i] = 0;
        long long mx = b[i],mn = b[i];
        for(int j = i;j >= 1 && i - j + 1 <= 4;--j){
            mx = std::max(mx,(long long)b[j]);
            mn = std::min(mn,(long long)b[j]);
            f[i] = std::max(f[i],f[j - 1] + mx - mn);
        }
    }
    return f[(int)b.size() - 1];
}
void update(long long &ans,int i,int x){
    if(i > 1 && i < n){
        if((diff[i - 1] < 0) != (diff[i] < 0)){
            ans += std::min(abs(diff[i - 1]),abs(diff[i]));
        }
    }
    if(i < n - 1){
        if((diff[i] < 0) != (diff[i + 1] < 0)){
            ans += std::min(abs(diff[i]),abs(diff[i + 1]));
        }
    }
    if(i < n && i > 0){
        ans -= abs(diff[i]);
    }
    diff[i] += x;
    if(i < n && i > 0){
        ans += abs(diff[i]);
    }
    if(i > 1 && i < n){
        if((diff[i - 1] < 0) != (diff[i] < 0)){
            ans -= std::min(abs(diff[i - 1]),abs(diff[i]));
        }
    }
    if(i < n - 1){
        if((diff[i] < 0) != (diff[i + 1] < 0)){
            ans -= std::min(abs(diff[i]),abs(diff[i + 1]));
        }
    }
}
void solve(){
    long long ans = 0;
    for(int i = 1;i < n;++i){
        if(i < n - 1 && (diff[i] < 0) != (diff[i + 1] < 0)){
            ans -= std::min(abs(diff[i]),abs(diff[i + 1]));
        }
        ans += abs(diff[i]);
    }
//    std::cout << ans << newl;
    for(int i = 1;i <= q;++i){
        int l,r,x;
        std::cin >> l >> r >> x;
        for(int j = l;j <= r;++j){
            a[j] += x;
        }
//        update(ans,l - 1,x);
//        update(ans,r,-x);
//        assert(calc() == ans);
        std::cout << calc() << newl;
    }
}
int main(){
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);std::cout.tie(nullptr);
    readData();
    solve();
    return 0;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct

Subtask #2
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 79 ms 4772 KB Output is correct
8 Correct 88 ms 4752 KB Output is correct
9 Correct 95 ms 4700 KB Output is correct
10 Correct 89 ms 4696 KB Output is correct
11 Correct 75 ms 4772 KB Output is correct
12 Correct 122 ms 4700 KB Output is correct

Subtask #3
0 / 55.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 79 ms 4772 KB Output is correct
8 Correct 88 ms 4752 KB Output is correct
9 Correct 95 ms 4700 KB Output is correct
10 Correct 89 ms 4696 KB Output is correct
11 Correct 75 ms 4772 KB Output is correct
12 Correct 122 ms 4700 KB Output is correct
13 Execution timed out 2025 ms 10300 KB Time limit exceeded
14 Halted 0 ms 0 KB -