Submission #67180

#	Time	Username	Problem	Language	Result	Execution time	Memory
67180		MrTEK	Maxcomp (info1cup18_maxcomp)	C++14	100 / 100	425 ms	24980 KiB

maxcomp

#include <bits/stdc++.h>
 
using namespace std;
#define mp make_pair
#define pb push_back
#define len(a) (int)a.size()
#define fi first
#define sc second
#define d1(w) cerr<<#w<<":"<<w<<endl;
#define d2(w,c) cerr<<#w<<":"<<w<<" "<<#c<<":"<<c<<endl;
#define d3(w,c,z) cerr<<#w<<":"<<w<<" "<<#c<<":"<<c<<" "<<#z<<":"<<z<<endl;
#define left ind+ind
#define right ind+ind+1
#define mid (l+r)/2
#define FAST_IO ios_base::sync_with_stdio(false);
#define endl '\n'
 
const int maxn = 620;
const long long LINF = 1e18;
const int LOG = 31;
const int INF = 1e9;
const int N = 1e3 + 5;
const int M = 4;
const int SQ = 350;
const int MOD = 998244353;
 
typedef pair <int,int> pii;
 
struct node {
	int val,x,y;
};
 
bool operator < (node a ,node b) {
	return a.val < b.val;
}
 
vector <pair<int,pii> > v;
 
queue <node> Q;
 
int n,m,mat[N][N],vis[N][N],ans = -INF,way[4][2] = {{1,0},{0,1},{0,-1},{-1,0}},mx,my;
 
int main() {
	scanf("%d %d",&n,&m);
	for (short int i = 1 ; i <= n ; i++)
		for (short int j = 1 ; j <= m ; j++) {
			scanf("%d",&mat[i][j]);
			vis[i][j] = -INF;
			v.pb(mp(mat[i][j],mp(i,j)));
		}
	sort(v.begin(),v.end());
	Q.push({v.back().fi,v.back().sc.fi,v.back().sc.sc});
	v.pop_back();
	while(len(Q)) {
		auto temp = Q.front();
		Q.pop();
		int  val = temp.val,x = temp.x,y = temp.y;
		if (vis[x][y] > val) continue;
		ans = max(ans,val - mat[x][y] - 1);
		while(len(v) && v.back().fi == val) {
			Q.push({v.back().fi,v.back().sc.fi,v.back().sc.sc});
			v.pop_back();
		}
		for (short int i = 0 ; i < 4 ; i++) {
			short int nx = x + way[i][0] , ny = y + way[i][1];
			if (nx > 0 && nx <= n && ny > 0 && ny <= m && val - 1 > vis[nx][ny]) {
				vis[nx][ny] = val - 1;
				Q.push({val - 1,nx,ny});				
			}
		}
	}
	printf("%d\n",ans);
 
}

Compilation message (stderr)

maxcomp.cpp: In function 'int main()':
maxcomp.cpp:44:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~
maxcomp.cpp:47:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&mat[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40