oj.uz

Submission #863799

# Submission time Handle Problem Language Result Execution time Memory
863799 2023-10-21T05:57:05 Z AtabayRajabli Raisins (IOI09_raisins) C++17
100 / 100
 266 ms 72280 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

// author : AtabeyR

#define pb          push_back
#define pii         pair<int, int>
#define pll         pair<ll, ll>
#define all(v)      v.begin(), v.end()
#define OPT         ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define sec         second
#define fi          first
#define int         ll
#define print(k)    cerr << "Ans : "; cout << k << endl;
#define ins         insert
#define bpc         __builtin_popcountll
#define skip        continue
#define endll        '\n'
#define gcd(a, b)   __gcd(a, b)
#define lcm(a, b)   a*b / (__gcd(a, b))

typedef long long ll;
typedef unsigned long long ull;
const int oo = 0x3F3F3F3F;
const int ooo = 0x3F3F3F3F3F3F3F3FLL;
const int mod = 998244353;
const int sz = 55;
using namespace std;
using namespace __gnu_pbds;
template<class T> using ordered_set = tree<T, null_type,less<T>, rb_tree_tag,tree_order_statistics_node_update>;

void open(string s)
{
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

int n, m, k, a[sz][sz], pref[sz][sz], dp[sz][sz][sz][sz];

int cost(int x1, int y1, int x2, int y2)
{
    return pref[x2][y2] - pref[x1-1][y2] - pref[x2][y1-1] + pref[x1-1][y1-1];
}

int f(int x1, int y1, int x2, int y2)
{
    if(x1 == x2 && y1 == y2)
        return 0;
    
    if(dp[x1][y1][x2][y2] != -1)
        return dp[x1][y1][x2][y2];

    int mn = ooo;
    for(int i = y1; i<y2; i++)
        mn = min(mn, f(x1, y1, x2, i) + f(x1, i+1, x2, y2) + cost(x1, y1, x2, y2));

    for(int j = x1; j<x2; j++)
        mn = min(mn, f(x1, y1, j, y2) + f(j+1, y1, x2, y2) + cost(x1, y1, x2, y2));

    return dp[x1][y1][x2][y2] = mn;
}

void solve()
{
    cin >> n >> m;

    for(int i = 1; i<=n; i++)
        for(int j = 1; j<=m; j++
            )cin >> a[i][j];

    for(int i = 1; i<=n; i++)
        for(int j = 1; j<=m; j++)
            pref[i][j] = pref[i-1][j] + pref[i][j-1] - pref[i-1][j-1] + a[i][j];

    memset(dp, -1, sizeof(dp));

    cout << f(1, 1, n, m) << endl;
}

int32_t main()
{
    // open("i");

    OPT
    int t = 1;
    //cin >> t;

    for(int i = 1; i<=t; i++)
        solve();
}

Compilation message

raisins.cpp: In function 'void open(std::string)':
raisins.cpp:35:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
raisins.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 71868 KB Output is correct
2 Correct 9 ms 72028 KB Output is correct
3 Correct 8 ms 72024 KB Output is correct
4 Correct 9 ms 72028 KB Output is correct
5 Correct 8 ms 72028 KB Output is correct
6 Correct 8 ms 72028 KB Output is correct
7 Correct 9 ms 71876 KB Output is correct
8 Correct 11 ms 72024 KB Output is correct
9 Correct 13 ms 72028 KB Output is correct
10 Correct 15 ms 71924 KB Output is correct
11 Correct 17 ms 71924 KB Output is correct
12 Correct 30 ms 71884 KB Output is correct
13 Correct 43 ms 72108 KB Output is correct
14 Correct 20 ms 72028 KB Output is correct
15 Correct 51 ms 72280 KB Output is correct
16 Correct 12 ms 71880 KB Output is correct
17 Correct 25 ms 72140 KB Output is correct
18 Correct 148 ms 72276 KB Output is correct
19 Correct 258 ms 72128 KB Output is correct
20 Correct 266 ms 72148 KB Output is correct