Submission #909857

#	Time	Username	Problem	Language	Result	Execution time	Memory
909857		8pete8	Nafta (COI15_nafta)	C++17	34 / 100	1031 ms	46200 KiB

nafta

#include<iostream>
#include<stack>
#include<map>
#include<vector>
#include<string>
#include<unordered_map>
#include <queue>
#include<cstring>
#include<float.h>
#include<limits.h>
#include <cassert>
#include<cmath>
#include<set>
#include<algorithm>
#include <iomanip>
#include<numeric> //gcd(a,b)
#include<bitset>
using namespace std;
#define ll long long
#define f first
#define endl "\n"
#define s second
#define pii pair<int,ll>
#define ppii pair<int,pii>
#define vi vector<int>
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define F(n) for(int i=0;i<n;i++)
#define lb lower_bound
#define ub upper_bound
using namespace std;
#define int long long
#define double long double
#define fastio ios::sync_with_stdio(false);cin.tie(NULL);
#pragma GCC optimize ("03,unroll-loops")
const int mod=1e9+7,mxn=3e5,lg=30,inf=1e18,minf=-1e9,Mxn=100000;
int n,m;
char grid[2002][2002];
int dp[2002][2002],val[2002],cost[2002][2002],on[2002];
bool vis[2002][2002];
int u[4]={0,0,1,-1},r[4]={1,-1,0,0};
int ans=0,sum=0;
void dfs(int cx,int cy){
    on[cy]=1;
    sum+=(grid[cx][cy]-'0');
    vis[cx][cy]=true;
    for(int i=0;i<4;i++){
        int nx=cx+u[i],ny=cy+r[i];
        if(nx<0||ny<0||nx>=n||ny>=m)continue;
        if(vis[nx][ny]||grid[nx][ny]=='.')continue;
        dfs(nx,ny);
    }
}
int32_t main(){
    fastio
    int sub=0;
    cin>>n>>m;
    for(int i=0;i<n;i++)for(int j=0;j<m;j++)cin>>grid[i][j];
    for(int i=0;i<n;i++)for(int j=0;j<m;j++){
        if(vis[i][j]||grid[i][j]=='.')continue;
        sum=0;
        dfs(i,j);
        for(int k=0;k<m;k++)if(on[k]){
            val[k]+=sum;
            for(int l=0;l<k;l++)if(on[l])cost[l][k]+=sum;
        }
        for(int k=0;k<m;k++)on[k]=0;
    }
    for(int i=1;i<=m;i++){
        for(int j=0;j<m;j++){
            dp[j][i]=val[j];
            if(j)dp[j][i]=max(dp[j][i],dp[j-1][i]);
            for(int l=0;l<j;l++)dp[j][i]=max(dp[j][i],dp[l][i-1]-cost[l][j]+val[j]);
        }
    }
    for(int i=1;i<=m;i++)cout<<dp[m-1][i]<<'\n';
}

Compilation message (stderr)

nafta.cpp: In function 'int32_t main()':
nafta.cpp:57:9: warning: unused variable 'sub' [-Wunused-variable]
   57 |     int sub=0;
      |         ^~~

• Subtask 1: 11 / 11
• Subtask 2: 23 / 23
• Subtask 3: 0 / 66