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Submission #935950

# Submission time Handle Problem Language Result Execution time Memory
935950 2024-02-29T19:46:47 Z noyancanturk Nafta (COI15_nafta) C++17
100 / 100
 155 ms 80732 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;
    
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;
        }
    }
    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<<15;
    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;
    }
    char out[sz];
    int curind=0;
    inline void flush(){
        fwrite(out,1,curind,stdout);
        curind=0;
    }
    inline void putchar(char c){
        out[curind++]=c;
        if(curind==sz)flush();
    }
    char temp[10];
    inline void putint(int i){
        int lll=0;
        while(i){
            temp[lll++]=(i%10)+'0';
            i/=10;
        }
        while(lll){
            putchar(temp[--lll]);
        }
        putchar('\n');
    }
}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];
    }
    cout<<*max_element(dp[0]+1,dp[0]+m+1)<<"\n";
    for(int i=1;i<m;i++){
        curl=i;
        dnc(i,m,1,m);
        cout<<*max_element(dp[i]+i+1,dp[i]+m+1)<<"\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 14936 KB Output is correct
2 Correct 2 ms 14936 KB Output is correct
3 Correct 2 ms 15008 KB Output is correct
4 Correct 2 ms 14940 KB Output is correct
5 Correct 2 ms 14936 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14936 KB Output is correct
2 Correct 2 ms 14936 KB Output is correct
3 Correct 2 ms 15008 KB Output is correct
4 Correct 2 ms 14940 KB Output is correct
5 Correct 2 ms 14936 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 4 ms 21084 KB Output is correct
8 Correct 6 ms 21084 KB Output is correct
9 Correct 5 ms 21596 KB Output is correct
10 Correct 4 ms 21084 KB Output is correct
11 Correct 4 ms 21080 KB Output is correct
12 Correct 4 ms 21084 KB Output is correct

Subtask #3
66.0 / 66.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14936 KB Output is correct
2 Correct 2 ms 14936 KB Output is correct
3 Correct 2 ms 15008 KB Output is correct
4 Correct 2 ms 14940 KB Output is correct
5 Correct 2 ms 14936 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 4 ms 21084 KB Output is correct
8 Correct 6 ms 21084 KB Output is correct
9 Correct 5 ms 21596 KB Output is correct
10 Correct 4 ms 21084 KB Output is correct
11 Correct 4 ms 21080 KB Output is correct
12 Correct 4 ms 21084 KB Output is correct
13 Correct 87 ms 67152 KB Output is correct
14 Correct 119 ms 63060 KB Output is correct
15 Correct 155 ms 80732 KB Output is correct
16 Correct 81 ms 63000 KB Output is correct
17 Correct 59 ms 60868 KB Output is correct
18 Correct 59 ms 60836 KB Output is correct