Submission #94838

#	Time	Username	Problem	Language	Result	Execution time	Memory
94838		easrui	Pinball (JOI14_pinball)	C++14	0 / 100	3 ms	376 KiB

pinball

#include <bits/stdc++.h>
using namespace std;
const int MaxM = 11;
const int MaxN = 1e3+5;
const long long INF = 1e15;
int M,N,sum;
long long ans=INF,cnt;
bool res[MaxN];
struct Pin{
    int A,B,C,D;
}P[MaxM];
int main()
{
    freopen("input.txt","r",stdin);
    ios_base::sync_with_stdio(0),cin.tie(0);
    cin >> M >> N;
    for(int i=0; i<M; i++) cin >> P[i].A >> P[i].B >> P[i].C >> P[i].D;
    int sz = 1<<M;
    for(int i=0; i<sz; i++){
        fill(res,res+N,1);
        cnt = 0;
        for(int j=0; j<M; j++){
            if(i&(1<<j)){
                sum = 0;
                cnt += P[j].D;
                for(int k=P[j].A; k<=P[j].B; k++){
                    sum += res[k];
                    res[k] = 0;
                }
                if(sum) res[P[j].C] = 1;
            }
        }
        sum=0;
        for(int j=1; j<=N; j++) sum += res[j];
        //if(i==31) cout << res[0] << '\n';
        //cout << sum << ' ' << i << '\n';
        if(sum==1) ans = min(ans,cnt);
    }
    if(ans == INF) cout << -1;
    else cout << ans;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("input.txt","r",stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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