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Submission #935953

# Submission time Handle Problem Language Result Execution time Memory
935953 2024-02-29T19:49:43 Z noyancanturk Nafta (COI15_nafta) C++17
100 / 100
 151 ms 80696 KB 
#ifndef Local
    #pragma GCC optimize("O3,unroll-loops")
    const int lim=2e3+5;
#else
    const int lim=1e3+3;
#endif
    
#include "bits/stdc++.h"
using namespace std;
    
//#define int int64_t
#define pb push_back
    
int mod=1e9+7;
//const int mod=(1ll<<61)-1;
    
using pii=pair<int,int>;
    
char s[lim][lim];
    
int n,m,gn=0;
bool vis[lim*lim];
int parent[lim*lim];
int val[lim*lim/2],ll[lim*lim/2],rr[lim*lim/2];
    
inline void dfs(int node,int par){
    vis[node]=1;
    int x=node/lim,y=node%lim;
    parent[node]=parent[par];
    val[gn]+=s[x][y]-'0';
    ll[gn]=min(ll[gn],y);
    rr[gn]=max(rr[gn],y);
    for(int dd:{1,-1,lim,-lim}){
        if(!vis[node+dd]){
            dfs(node+dd,node);
        }
    }
}
    
#define P(i,j) ((i)*lim+(j))
    
int g[lim][lim];
    
int dp[lim][lim],curl;
int ansss=INT_MIN;
    
inline void dnc(int l,int r,int optl,int optr){
    int mid=(l+r)>>1;
    int opt=min(optr,mid-1);
    dp[curl][mid]=g[mid][opt]+dp[curl-1][opt];
    for(int i=opt;optl<=i;i--){
        if(dp[curl][mid]<g[mid][i]+dp[curl-1][i]){
            dp[curl][mid]=g[mid][i]+dp[curl-1][i];
            opt=i;
        }
    }
    ansss=max(ansss,dp[curl][mid]);
    if(l<=mid-1)dnc(l,mid-1,optl,opt);
    if(mid+1<=r)dnc(mid+1,r,opt,optr);
}
struct inpout{
    static const int sz=1<<17;
    char inp[sz];
    int curc=0,len=0;
    inline char gc(){
        if(curc==len){
            len=(int)fread(inp,1,sz,stdin);
            curc=0;
            if(!len)return -1;
        }
        return inp[curc++];
    }
    inline void readstr(char*c,int ll){
        for(int i=0;i<ll;i++){
            c[i]=gc();
        }
        gc();
    }
    inline int readint(){
        char c=gc();
        bool isneg=(c=='-');
        int ans=0;
        if(!isneg)ans=c-'0';
        c=gc();
        while('0'<=c&&c<='9'){
            ans=10*ans+c-'0';
            c=gc();
        }
        if(isneg)return -ans;
        return ans;
    }
}io;
inline void solve(){
    n=io.readint(),m=io.readint();
    for(int i=0;i<m+2;i++){
        s[0][i]=s[n+1][i]='.';
        vis[P(0,i)]=vis[P(n+1,i)]=1;
    }
    for(int i=1;i<=n;i++){
        vis[P(i,0)]=vis[P(i,m+1)]=1;
        for(int j=1;j<=m;j++){
            if((s[i][j]=io.gc())=='.'){
                vis[P(i,j)]=1;
            }
        }
        io.gc();
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(!vis[P(i,j)]){
                val[gn]=0;
                ll[gn]=INT_MAX;
                rr[gn]=-1;
                parent[P(i,j)]=gn;
                dfs(P(i,j),-1);
                gn++;
            }
        }
    }
    for(int i=0;i<gn;i++){
        g[ll[i]][0]+=val[i];
        g[ll[i]][ll[i]]-=val[i];
        g[rr[i]+1][0]-=val[i];
        g[rr[i]+1][ll[i]]+=val[i];
    }
    for(int i=0;i<=m;i++){
        for(int j=1;j<=m;j++){
            g[i][j]+=g[i][j-1];
        }
    }
    for(int i=0;i<=m;i++){
        for(int j=1;j<=m;j++){
            g[j][i]+=g[j-1][i];
        }
    }
    dp[0][0]=0;
    for(int i=1;i<=m;i++){
        dp[0][i]=g[i][0];
        ansss=max(ansss,dp[0][i]);
    }
    cout<<ansss<<"\n";
    for(int i=1;i<m;i++){
        ansss=INT_MIN;
        curl=i;
        dnc(i,m,1,m);
        cout<<ansss<<"\n";
    }
}
    
signed main(){
#ifdef Local  
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
#endif
    solve();
}

Compilation message

nafta.cpp: In function 'void solve()':
nafta.cpp:29:28: warning: array subscript -1 is below array bounds of 'int [4020025]' [-Warray-bounds]
   29 |     parent[node]=parent[par];
      |                  ~~~~~~~~~~^
nafta.cpp:23:5: note: while referencing 'parent'
   23 | int parent[lim*lim];
      |     ^~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 16988 KB Output is correct
2 Correct 3 ms 16988 KB Output is correct
3 Correct 2 ms 16988 KB Output is correct
4 Correct 3 ms 16732 KB Output is correct
5 Correct 2 ms 16732 KB Output is correct
6 Correct 2 ms 16732 KB Output is correct

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 16988 KB Output is correct
2 Correct 3 ms 16988 KB Output is correct
3 Correct 2 ms 16988 KB Output is correct
4 Correct 3 ms 16732 KB Output is correct
5 Correct 2 ms 16732 KB Output is correct
6 Correct 2 ms 16732 KB Output is correct
7 Correct 5 ms 23132 KB Output is correct
8 Correct 5 ms 23132 KB Output is correct
9 Correct 6 ms 21596 KB Output is correct
10 Correct 5 ms 23132 KB Output is correct
11 Correct 4 ms 21084 KB Output is correct
12 Correct 4 ms 21156 KB Output is correct

Subtask #3
66.0 / 66.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 16988 KB Output is correct
2 Correct 3 ms 16988 KB Output is correct
3 Correct 2 ms 16988 KB Output is correct
4 Correct 3 ms 16732 KB Output is correct
5 Correct 2 ms 16732 KB Output is correct
6 Correct 2 ms 16732 KB Output is correct
7 Correct 5 ms 23132 KB Output is correct
8 Correct 5 ms 23132 KB Output is correct
9 Correct 6 ms 21596 KB Output is correct
10 Correct 5 ms 23132 KB Output is correct
11 Correct 4 ms 21084 KB Output is correct
12 Correct 4 ms 21156 KB Output is correct
13 Correct 101 ms 67200 KB Output is correct
14 Correct 120 ms 63060 KB Output is correct
15 Correct 151 ms 80696 KB Output is correct
16 Correct 77 ms 63048 KB Output is correct
17 Correct 58 ms 63060 KB Output is correct
18 Correct 62 ms 63072 KB Output is correct