Submission #403519

#	Time	Username	Problem	Language	Result	Execution time	Memory
403519		jamezzz	조개 줍기 (KOI17_shell)	C++14	46 / 100	2056 ms	31056 KiB

shell

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#include <ext/rope>
using namespace __gnu_cxx;

typedef tree<long long, null_type, less<long long>,
rb_tree_tag, tree_order_statistics_node_update> pbds;
//less_equal for identical elements

#define DEBUG

#ifdef DEBUG
#define debug(...) printf(__VA_ARGS__);
#else
#define debug(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define sz(x) (int)x.size()
#define mnto(x,y) x=min(x,(__typeof__(x))y)
#define mxto(x,y) x=max(x,(__typeof__(x))y)
#define INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vll;

int n,a[1505][1505];
ll dp[1505][1505];
bool vis[1505][1505];
ll s=0;
char t;
int r,c;
queue<ii> q;

int main(){
	sf("%d",&n);
	for(int i=1;i<=n;++i){
		for(int j=1;j<=n;++j){
			sf("%d",&a[i][j]);
		}
	}
	for(int i=1;i<=n;++i){
		for(int j=1;j<=n;++j){
			dp[i][j]=a[i][j]+max(dp[i-1][j],dp[i][j-1]);
			s+=dp[i][j];
		}
	}
	pf("%lld\n",s);
	for(int i=0;i<n;++i){
		sf(" %c",&t);
		sf("%d%d",&r,&c);
		if(t=='U')++a[r][c];
		else --a[r][c];
		q.push(ii(r,c));
		vis[r][c]=true;
		while(!q.empty()){
			int x,y;tie(x,y)=q.front();q.pop();
			vis[x][y]=false;
			ll pv=dp[x][y];
			s-=dp[x][y];
			dp[x][y]=a[x][y]+max(dp[x-1][y],dp[x][y-1]);
			s+=dp[x][y];
			if(pv!=dp[x][y]){
				if(x!=n&&!vis[x+1][y]){
					q.push(ii(x+1,y));
					vis[x+1][y]=true;
				}
				if(y!=n&&!vis[x][y+1]){
					q.push(ii(x,y+1));
					vis[x][y+1]=true;
				}
			}
		}
		printf("%lld\n",s);
	}
}

Compilation message (stderr)

shell.cpp: In function 'int main()':
shell.cpp:50:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |  sf("%d",&n);
      |    ^
shell.cpp:53:6: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |    sf("%d",&a[i][j]);
      |      ^
shell.cpp:64:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |   sf(" %c",&t);
      |     ^
shell.cpp:65:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |   sf("%d%d",&r,&c);
      |     ^

• Subtask 1: 12 / 12
• Subtask 2: 34 / 34
• Subtask 3: 0 / 54