제출 #981746

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
981746		12345678	Nafta (COI15_nafta)	C++17	11 / 100	30 ms	47452 KiB

nafta

#include <bits/stdc++.h>

using namespace std;

const int nx=2005;

int n, m, mp[nx][nx], dp[nx][nx], mn[nx][nx], cnt[nx][nx], g[nx][nx], t, s[nx][nx],vs[nx][nx], dx[4]={0, 0, 1, -1}, dy[4]={1, -1, 0, 0}, ans[nx];
char ch;
queue<pair<int, int>> q;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n; i++) for (int j=1; j<=m; j++) cin>>ch, mp[i][j]=(ch=='.')?-1:ch-'0';
    for (int i=1; i<=n; i++)
    {
        for (int j=1; j<=m; j++)
        {
            if (vs[i][j]||mp[i][j]==-1) continue;
            q.push({i, j});
            vs[i][j]=1;
            int k=INT_MAX, sm=0;
            vector<pair<int, int>> v;
            while (!q.empty())
            {
                v.push_back(q.front());
                auto [x, y]=q.front();
                q.pop();
                k=min(k, y);
                sm+=mp[x][y];
                for (int d=0; d<4; d++)
                {
                    int nwx=x+dx[d], nwy=y+dy[d];
                    if (nwx<1||nwx>n||nwy<1||nwy>m||mp[nwx][nwy]==-1||vs[nwx][nwy]) continue;
                    q.push({nwx, nwy});
                    vs[nwx][nwy]=1;
                }
            }
            ++t;
            for (auto [x, y]:v) g[x][y]=t, mn[x][y]=k, s[x][y]=sm; //cout<<"group "<<t<<' '<<x<<' '<<y<<'\n';
        }
    }
    for (int i=1; i<=m; i++)
    {
        vector<int> v(nx);
        for (int j=1; j<=n; j++)
        {
            if (mp[j][i]==-1||v[g[j][i]]) continue;
            v[g[j][i]]=1;
            if (mn[j][i]==0) return 1/0;
            cnt[i][mn[j][i]-1]+=s[j][i];
        }
        for (int j=i; j>=0; j--) cnt[i][j]+=cnt[i][j+1]; //cout<<"debug "<<i<<' '<<j<<' '<<cnt[i][j]<<'\n';
    }
    if (n>50) return 0;
    for (int i=1; i<=m; i++)
    {
        for (int j=1; j<=m; j++)
        {
            for (int k=0; k<i; k++)
            {
                dp[i][j]=max(dp[i][j], dp[k][j-1]+cnt[i][k]);
            }
            ans[j]=max(ans[j], dp[i][j]);
        }
    }
    for (int i=1; i<=m; i++) cout<<ans[i]<<'\n';
}

컴파일 시 표준 에러 (stderr) 메시지

nafta.cpp: In function 'int main()':
nafta.cpp:51:38: warning: division by zero [-Wdiv-by-zero]
   51 |             if (mn[j][i]==0) return 1/0;
      |                                     ~^~

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