Submission #1101003

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101003		alexander707070	Wombats (IOI13_wombats)	C++14	76 / 100	20041 ms	26688 KiB

wombats

#include<bits/stdc++.h>
#include "wombats.h"
using namespace std;
 
const int bucket_sz=700;
 
const int inf=1e9;
 
int n,m;
int rows[5007][207];
int cols[207][5007];
 
int bucket[5007];
pair<int,int> seg[5007];
 
int dp[207][207][2][207];
int optl[207],optr[207];
 
int getsum(int row,int l,int r){
    return rows[row][r]-rows[row][l-1];
}
 
void calcdp(int buck,int from,int to){
 
    for(int fin=1;fin<=m;fin++){
        for(int c=1;c<=m;c++){
            dp[buck][fin][to%2][c]=getsum(to,min(c,fin),max(c,fin)-1);
        }
 
        for(int r=to-1;r>=from;r--){
            
            optl[1]=dp[buck][fin][1-r%2][1]+cols[1][r];
            for(int c=2;c<=m;c++){
                optl[c]=min(optl[c-1]+getsum(r,c-1,c-1),dp[buck][fin][1-r%2][c]+cols[c][r]);
            }
 
            optr[m]=dp[buck][fin][1-r%2][m]+cols[m][r];
            for(int c=m-1;c>=1;c--){
                optr[c]=min(optr[c+1]+getsum(r,c,c),dp[buck][fin][1-r%2][c]+cols[c][r]);
            }
 
            for(int c=1;c<=m;c++){
                dp[buck][fin][r%2][c]=min(optl[c],optr[c]);
            }
        }
    }
}
 
int dp2[207][2][207];
 
int dist(int buck,int from,int to){
    return dp[buck][to][seg[buck].first%2][from];
}
 
void solve(){
    for(int start=1;start<=m;start++){
        for(int i=0;i<=n/bucket_sz;i++){
            for(int c=1;c<=m;c++){
 
                dp2[start][i%2][c]=inf;
 
                if(i==0){
                    dp2[start][i%2][c]=dist(i,start,c);
                    continue;
                }
 
                for(int k=1;k<=m;k++){
                    dp2[start][i%2][c]=min(dp2[start][i%2][c],dist(i,k,c)+cols[k][seg[i-1].second]+dp2[start][1-i%2][k]);
                }
            }
        }
    }
}
 
void init(int R, int C, int H[5000][200], int V[5000][200]) {
//void init(int R,int C,vector< vector<int> > H,vector< vector<int> > V){
    n=R; m=C;
 
    for(int i=1;i<=n;i++){
        for(int f=1;f<=m-1;f++){
            rows[i][f]=H[i-1][f-1];
            rows[i][f]+=rows[i][f-1];
        }
    }
    for(int i=1;i<=m;i++){
        for(int f=1;f<=n-1;f++){
            cols[i][f]=V[f-1][i-1];
        }
    }
 
    for(int i=1;i<=n;i++){
        bucket[i]=i/bucket_sz;
        if(seg[bucket[i]].first==0)seg[bucket[i]].first=i;
        seg[bucket[i]].second=i;
    }
 
    for(int i=0;i<=n/bucket_sz;i++){
        calcdp(i,seg[i].first,seg[i].second);
    }
    solve();
}
 
void changeH(int P, int Q, int W) {
    P++; Q++;
 
    int dif=W-(rows[P][Q]-rows[P][Q-1]);
    for(int i=Q;i<=m-1;i++){
        rows[P][i]+=dif;
    }
    
    calcdp(bucket[P],seg[bucket[P]].first,seg[bucket[P]].second);
    solve();
}
 
void changeV(int P, int Q, int W){
    P++; Q++;
    cols[Q][P]=W;
 
    if(bucket[P]==bucket[P+1]){
        calcdp(bucket[P],seg[bucket[P]].first,seg[bucket[P]].second);
    }

    solve();
}
 
int escape(int V1, int V2) {
    V1++; V2++;
 
    return dp2[V1][(n/bucket_sz)%2][V2];
}
 
/*int main(){
 
    init(4,1,{{}},{{1},{1},{1},{1}});
 
    cout<<escape(0,0)<<"\n";
    changeV(0,0,2);
    cout<<escape(0,0)<<"\n";
    changeV(1,0,2);
    cout<<escape(0,0)<<"\n";
    changeV(2,0,2);
    cout<<escape(0,0)<<"\n";
 
    init(3,4,{{0,2,5},{7,1,1},{0,4,0}},{{0,0,0,2},{0,3,4,7}});
 
    cout<<escape(2,1)<<"\n";
    cout<<escape(3,3)<<"\n";
 
    changeV(0,0,5);
    changeH(1,1,6);
 
    cout<<escape(2,1)<<"\n";
 
	return 0;
}*/

Compilation message (stderr)

grader.c: In function 'int main()':
grader.c:15:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   15 |  int res;
      |      ^~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 21 / 21
• Subtask 6: 0 / 24