oj.uz

Submission #372836

# Submission time Handle Problem Language Result Execution time Memory
372836 2021-03-01T23:22:02 Z AmineWeslati The Kingdom of JOIOI (JOI17_joioi) C++14
60 / 100
 4000 ms 31264 KB 
//Never stop trying
#include "bits/stdc++.h"
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef long long ll;
typedef string str;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)

const int MOD = 1e9 + 7; //998244353
const ll INF = 1e9;
const int MX = 2000 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up

template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
ll random(ll a, ll b){
    return a + rng() % (b - a + 1);
}
#ifndef LOCAL  
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl; 
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;

void IO() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin); 
    freopen("output.txt", "w", stdout);
#endif
}
/////////////////////////ONLY CLEAN CODES ALLOWED/////////////////////////


int N,M,mn=INF,mx=-INF;
V<vi>g;

bool solve(int K){
	int top=-1;

	bool ok=1;
	FOR(j,0,sz(g[0])){
		ROF(i,0,sz(g)) if(!(g[i][j]>=mx-K)){
			ckmax(top,i);
			break;
		}
		FOR(i,0,top+1) if(!(g[i][j]<=mn+K)){
			ok=0;
		}
	}
	if(ok) return 1;

	ok=1;
	ROF(j,0,sz(g[0])){
		ROF(i,0,sz(g)) if(!(g[i][j]>=mx-K)){
			ckmax(top,i);
			break;
		}
		FOR(i,0,top+1) if(!(g[i][j]<=mn+K)){
			ok=0;
		}
	}
	return ok;
}


void rotate(){
	int n=sz(g),m=sz(g[0]); 

	V<vi>gg; 
	gg.resize(m); 
    FOR(i,0,m) gg[i].resize(n);

    FOR(i,0,n) FOR(j,0,m){
    	gg[j][n-1-i]=g[i][j];
    }

    g.resize(m);
    FOR(i,0,m) g[i].assign(all(gg[i]));
}

bool check(int K){
	int ans=0;
	FOR(i,0,4){
		ans|=solve(K);
		rotate();
	}
	return ans;
}

int main() {
    boost; IO();

    cin>>N>>M;
    g.resize(N); 
    FOR(i,0,N) g[i].resize(M);
    FOR(i,0,N) FOR(j,0,M){
    	cin>>g[i][j];
    	ckmin(mn,g[i][j]);
    	ckmax(mx,g[i][j]);
	}

	int l=0,r=INF,ans;
	while(l<=r){
		int m=(l+r)/2;
		if(check(m)){
			ans=m;
			r=m-1;
		}
		else l=m+1;
	}
	cout << ans << endl;


    

    return 0;
}
//Change your approach

Compilation message

joioi.cpp: In function 'int main()':
joioi.cpp:19:14: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   19 | #define endl "\n"
      |              ^~~~
joioi.cpp:124:16: note: 'ans' was declared here
  124 |  int l=0,r=INF,ans;
      |                ^~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 492 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 4 ms 364 KB Output is correct
16 Correct 27 ms 748 KB Output is correct
17 Correct 35 ms 996 KB Output is correct
18 Correct 34 ms 876 KB Output is correct
19 Correct 41 ms 996 KB Output is correct
20 Correct 31 ms 876 KB Output is correct
21 Correct 41 ms 1108 KB Output is correct
22 Correct 37 ms 1004 KB Output is correct
23 Correct 44 ms 1108 KB Output is correct
24 Correct 33 ms 1004 KB Output is correct
25 Correct 38 ms 1108 KB Output is correct
26 Correct 41 ms 1108 KB Output is correct
27 Correct 41 ms 1108 KB Output is correct
28 Correct 39 ms 724 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 4 ms 364 KB Output is correct
16 Correct 27 ms 748 KB Output is correct
17 Correct 35 ms 996 KB Output is correct
18 Correct 34 ms 876 KB Output is correct
19 Correct 41 ms 996 KB Output is correct
20 Correct 31 ms 876 KB Output is correct
21 Correct 41 ms 1108 KB Output is correct
22 Correct 37 ms 1004 KB Output is correct
23 Correct 44 ms 1108 KB Output is correct
24 Correct 33 ms 1004 KB Output is correct
25 Correct 38 ms 1108 KB Output is correct
26 Correct 41 ms 1108 KB Output is correct
27 Correct 41 ms 1108 KB Output is correct
28 Correct 39 ms 724 KB Output is correct
29 Execution timed out 4058 ms 31264 KB Time limit exceeded
30 Halted 0 ms 0 KB -