Submission #489379

#	Time	Username	Problem	Language	Result	Execution time	Memory
489379		bigDuck	Collecting Stamps 3 (JOI20_ho_t3)	C++14	15 / 100	6 ms	1484 KiB

ho_t3

#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
#define count_bits __builtin_popcount
#define int ll

int n, l, x[201], t[201];


pii mom[205][205][2];

int32_t main(){
INIT
cin>>n>>l;
for(int i=1; i<=n; i++){
    cin>>x[i];
}
for(int i=1; i<=n; i++){
    cin>>t[i];
}

pii hlt={-1, -1};
for(int i=0; i<=(n+1); i++){
    for(int j=0; j<=(n+1); j++){
        mom[i][j][0]=mom[i][j][1]={-1, -1};
    }
}


mom[n+1][0][0]=mom[n+1][0][1]={0, 0};
x[n+1]=l;
//0-dreapta, 1-stanga
int res=0;
for(int i=(n+1); i>=1; i--){
    for(int j=0; j<i; j++){
        mom[i][j][0]=max(mom[i][j][0], {mom[i][j][1].ft, -(-mom[i][j][1].sc+l-x[i]+x[j] ) } );
        int cnt=mom[i][j][0].ft, ac=-mom[i][j][0].sc;
        if(cnt>=0){
        res=max(res, cnt);
        for(int k=j+1, ac2=ac; k<i; k++){
            ac2+=x[k]-x[k-1];
            if(ac2<=t[k]){
                mom[i][k][0]=max(mom[i][k][0], {cnt+1, -ac2});
            }
            else{
                mom[i][k][0]=max(mom[i][k][0], {cnt, -ac2});
            }
        }
        }

        mom[i][j][1]=max(mom[i][j][1], {mom[i][j][0].ft, -(-mom[i][j][0].sc+x[j]+l-x[i]) } );
        cnt=mom[i][j][1].ft, ac=-mom[i][j][1].sc;
        if(cnt>=0){
                res=max(res, cnt);
        for(int k=i-1, ac2=ac; k>j; k--){
            ac2+=x[k+1]-x[k];
            if(ac2<=t[k]){
                mom[k][j][1]=max(mom[k][j][1], {cnt+1, -ac2} );
            }
            else{
                mom[k][j][1]=max(mom[k][j][1], {cnt, -ac2} );
            }
        }

        }
    }
}
cout<<res;

return 0;
}

Compilation message (stderr)

ho_t3.cpp: In function 'int32_t main()':
ho_t3.cpp:28:5: warning: variable 'hlt' set but not used [-Wunused-but-set-variable]
   28 | pii hlt={-1, -1};
      |     ^~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75