Submission #94846

#	Time	Username	Problem	Language	Result	Execution time	Memory
94846		easrui	Pinball (JOI14_pinball)	C++14	29 / 100	110 ms	98092 KiB

pinball

#include <bits/stdc++.h>
using namespace std;
const int MaxM = 210;
const long long INF = 1e15;
int M,N;
long long ans=INF,cnt,DP[MaxM][MaxM][MaxM];
struct Pin {
    int A,B,C,D;
} P[MaxM];
vector<int> pos;
int main()
{
    //freopen("input.txt","r",stdin);
    ios_base::sync_with_stdio(0),cin.tie(0);
    cin >> M >> N;
    for(int i=1; i<=M; i++) {
        cin >> P[i].A >> P[i].B >> P[i].C >> P[i].D;
        pos.push_back(P[i].C);
    }
    pos.push_back(1);
    pos.push_back(N);
    sort(pos.begin(),pos.end());
    pos.erase(unique(pos.begin(),pos.end()),pos.end());
    for(int i=1; i<=M; i++) {
        P[i].A = lower_bound(pos.begin(),pos.end(),P[i].A)-pos.begin();
        P[i].B = upper_bound(pos.begin(),pos.end(),P[i].B)-pos.begin()-1;
        P[i].C = lower_bound(pos.begin(),pos.end(),P[i].C)-pos.begin();
    }
    int sz = pos.size();
    for(int i=0; i<=M; i++)
        for(int l=0; l<sz; l++)
            for(int r=l; r<sz; r++)
                DP[l][r][i] = INF;
    DP[0][sz-1][0] = 0;
    for(int i=0; i<M; i++) {
        for(int l=0; l<sz; l++) {
            for(int r=l; r<sz; r++) {
                DP[l][r][i+1] = min(DP[l][r][i+1],DP[l][r][i]);
                bool left = P[i+1].A<=l && l<P[i+1].C, right = P[i+1].B>=r && r>P[i+1].C;
                cnt = DP[l][r][i]+P[i+1].D;
                if(P[i+1].A<=l && P[i+1].B>=r)
                    DP[P[i+1].C][P[i+1].C][i+1] = min(DP[P[i+1].C][P[i+1].C][i+1],cnt);
                else {
                    if(left)
                        DP[P[i+1].C][r][i+1] = min(DP[P[i+1].C][r][i+1],cnt);
                    if(right)
                        DP[l][P[i+1].C][i+1] = min(DP[l][P[i+1].C][i+1],cnt);
                }
            }
        }
    }
    for(int i=0; i<sz; i++)
        ans = min(ans,DP[i][i][M]);
    if(ans==INF)
        cout << -1;
    else
        cout << ans;
}

• Subtask 1: 11 / 11
• Subtask 2: 18 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 49