Submission #446145

#	Time	Username	Problem	Language	Result	Execution time	Memory
446145		JerryLiu06	Raisins (IOI09_raisins)	C++17	100 / 100	201 ms	30612 KiB

raisins

#include <bits/stdc++.h>
 
using namespace std;
 
using ll = long long;
using ld = long double;
using db = double;
using str = string;
 
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using pd = pair<db, db>;
 
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;
 
#define mp make_pair
#define f first
#define s second
 
#define sz(x) (int)(x).size()
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert 
#define ft front()
#define bk back()
#define pb push_back
#define pf push_front
 
#define lb lower_bound
#define ub upper_bound
 
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) FOR(i, 0, a)
#define ROF(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define R0F(i, a) ROF(i, 0, a)
#define EACH(a, x) for (auto& a : x)
 
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); }
ll fdiv(ll a, ll b) { return a / b - ((a ^ b) < 0 && a % b); }
 
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
 
template<class T> void remDup(vector<T>& v) { sor(v); v.erase(unique(all(v)), v.end()); }
 
const int MOD = 1e9 + 7;
const int MX = 55;
const ll INF = 1e18;

int N, M; int pref[MX][MX]; ll DP[MX][MX][MX][MX];

int query(int X1, int X2, int Y1, int Y2) {
    return pref[X2][Y2] - pref[X1 - 1][Y2] - pref[X2][Y1 - 1] + pref[X1 - 1][Y1 - 1];
}

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

    cin >> N >> M; FOR(i, 1, N + 1) FOR(j, 1, M + 1) { 
        cin >> pref[i][j]; pref[i][j] += pref[i - 1][j] + pref[i][j - 1] - pref[i - 1][j - 1]; 
    }
    ROF(X1, 1, N + 1) FOR(X2, X1, N + 1) ROF(Y1, 1, M + 1) FOR(Y2, Y1, M + 1) {
        if (X1 == X2 && Y1 == Y2) continue; DP[X1][X2][Y1][Y2] = query(X1, X2, Y1, Y2); ll MN = INF;

        FOR(X, X1, X2) ckmin(MN, DP[X1][X][Y1][Y2] + DP[X + 1][X2][Y1][Y2]);
        FOR(Y, Y1, Y2) ckmin(MN, DP[X1][X2][Y1][Y] + DP[X1][X2][Y + 1][Y2]);

        DP[X1][X2][Y1][Y2] += MN;
    }
    cout << DP[1][N][1][M];
}

Compilation message (stderr)

raisins.cpp: In function 'int main()':
raisins.cpp:72:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   72 |         if (X1 == X2 && Y1 == Y2) continue; DP[X1][X2][Y1][Y2] = query(X1, X2, Y1, Y2); ll MN = INF;
      |         ^~
raisins.cpp:72:45: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   72 |         if (X1 == X2 && Y1 == Y2) continue; DP[X1][X2][Y1][Y2] = query(X1, X2, Y1, Y2); ll MN = INF;
      |                                             ^~

• Subtask 1: 100 / 100