Submission #1293420

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293420		hiepsimauhong	K blocks (IZhO14_blocks)	C++20	0 / 100	73 ms	164816 KiB

blocks

#include <bits/stdc++.h>

using namespace std;

#define int long long

#define FOR(I, L, R) for(int I(L); I <= (int)R ; ++I)
#define FOD(I, R, L) for(int I(R); I >= (int)L ; --I)
#define FOA(I, A) for(auto &I : A)

#define print(A, L, R) FOR(I, L, R){cout << A[I] <<' ';} cout << '\n';
#define printz(A, L, R) FOR(I, 0, L){FOR(J, 0, R){if(A[I][J] >= oo / 10){cout << "- ";} else cout << A[I][J] << ' ';} cout << '\n';} cout << '\n';
#define prints(A) FOA(I, A) cout << I <<' '; cout << '\n';

#define fs first
#define sd second
#define ii pair<int, int>
#define iii pair<int, ii>
#define all(A) A.begin(), A.end()
#define quickly cin.tie(0) -> ios_base::sync_with_stdio(0);
#define FILE "dincpath"

const int N = 1e5 + 5;
const int K = 105;

const int mod = 1e9 + 7;
const int oo = 1e18;

struct Modint{
        int x;

        Modint(){x = 0;}
        Modint(int _x){x = (_x + mod) % mod;}

        Modint operator + (const Modint &other) const{ return Modint((x + other.x) % mod); }
        Modint operator - (const Modint &other) const{ return Modint((x - other.x + mod) % mod); }
        Modint operator * (const Modint &other) const{ return Modint((1LL * x * other.x) % mod); }

        void operator += (const Modint &other) { *this = *this + other; }
        void operator -= (const Modint &other) { *this = *this - other; }
        void operator *= (const Modint &other) { *this = *this * other; }

        friend ostream& operator << (ostream& os, const Modint &other){
                return os << other.x;
        }
};

int n, k;
int dp[K][N], opt[K][N], a[N];
stack<int> st;

signed main(){ quickly
        if(fopen(FILE".inp", "r")){
                freopen(FILE".inp", "r", stdin);
                freopen(FILE".out", "w", stdout);
        }

        cin >> n >> k;

        FOR(i, 1, n){
                cin >> a[i];
        }
        memset(dp, 0x3f, sizeof dp);
        memset(opt, 0x3f, sizeof opt);
        dp[0][0] = 0, opt[1][0] = 0;

        FOR(j, 1, k){
                st = stack<int>();
                st.push(0);

                FOR(i, 1, n){
                        int best = oo;

                        while(!st.empty() && a[st.top()] <= a[i]){
                                best = min(best, opt[j][st.top()]);
                                st.pop();
                        }

                        dp[j][i] = best + a[i];

                        if(!st.empty()){
                                dp[j][i] = min({dp[j][i], dp[j - 1][st.top()], dp[j][st.top()]});
                        }

                        opt[j][i] = min(best, dp[j - 1][i]);
                        st.push(i);
                }
        }

        cout << dp[k][n];
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:54:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |                 freopen(FILE".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:55:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |                 freopen(FILE".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47