답안 #63267 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
63267	2018-08-01T07:49:57 Z	노영훈(#1832)	Alternating Current (BOI18_alternating)	C++11	32 / 100	69 ms	3640 KB

alternating

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int MX=100010, inf=2e9;

int n, m;
struct line{
    int s, e, ans=-1, idx;
    void scan(){
        cin>>s>>e;
    }
    bool operator < (const line &l) const {
        return s<l.s || (s==l.s && e>l.e);
    }
} L[MX];

bool solve(){
    bool done[MX][2]={};


    priority_queue<pii> Q;
    for(int i=1, frt=0; i<=n; i++){
        while(frt<m && L[frt+1].s<=i) frt++, Q.push({L[frt].e, frt});
        for(int j=0; j<=1; j++){
            if(done[i][j]) continue;
            while(!Q.empty() && Q.top().first<i) Q.pop();
            if(Q.empty()) return false;
            int e,idx; tie(e,idx)=Q.top(); Q.pop();
            for(int x=i; x<=e; x++) done[x][j]=true;
            L[idx].ans=j;
        }
    }
    return true;
}

bool check(int s){
    bool fill[20][2]={};
    for(int i=1; i<=m; i++)
        for(int ii=L[i].s; ii<=(L[i].s<=L[i].e ? L[i].e : L[i].e+n); ii++){
            int t=!!(s&(1<<(i-1)));
            fill[(ii-1)%n+1][t]=true;
        }
    for(int i=1; i<=n; i++) if(!fill[i][0] || !fill[i][1]) return false;
    return true;
}

void solve1(){
    for(int i=0; i<(1<<m); i++){
        if(check(i)){
            for(int j=1; j<=m; j++) cout<<!!(i&(1<<(j-1)));
            exit(0);
        }
    }
    cout<<"impossible\n";
    exit(0);
}

int main(){
    ios::sync_with_stdio(0); cin.tie(0);
    cin>>n>>m;
    for(int i=1; i<=m; i++) L[i].scan(), L[i].idx=i;
    if(n<=15 && m<=15) solve1();
    sort(L+1, L+m+1);
    if(!solve()){ cout<<"impossible\n"; return 0; }
    sort(L+1, L+m+1, [](line &a, line &b){ return a.idx<b.idx; });
    for(int i=1; i<=m; i++) cout<<max(L[i].ans, 0);
    cout<<'\n';
    return 0;
}

Subtask #1
13.0 / 13.0

#	결과	실행 시간	메모리	Grader output
1	Correct	5 ms	1912 KB	Output is correct
2	Correct	3 ms	1912 KB	Output is correct
3	Correct	3 ms	1948 KB	Output is correct
4	Correct	3 ms	2028 KB	Output is correct
5	Correct	3 ms	2080 KB	Output is correct
6	Correct	5 ms	2080 KB	Output is correct
7	Correct	4 ms	2096 KB	Output is correct
8	Correct	4 ms	2152 KB	Output is correct
9	Correct	5 ms	2152 KB	Output is correct
10	Correct	4 ms	2152 KB	Output is correct
11	Correct	4 ms	2152 KB	Output is correct
12	Correct	4 ms	2152 KB	Output is correct
13	Correct	5 ms	2152 KB	Output is correct
14	Correct	4 ms	2152 KB	Output is correct
15	Correct	4 ms	2152 KB	Output is correct
16	Correct	4 ms	2152 KB	Output is correct
17	Correct	4 ms	2160 KB	Output is correct
18	Correct	5 ms	2160 KB	Output is correct
19	Correct	4 ms	2160 KB	Output is correct
20	Correct	4 ms	2160 KB	Output is correct
21	Correct	4 ms	2160 KB	Output is correct
22	Correct	4 ms	2160 KB	Output is correct
23	Correct	3 ms	2160 KB	Output is correct
24	Correct	4 ms	2160 KB	Output is correct
25	Correct	4 ms	2160 KB	Output is correct
26	Correct	4 ms	2160 KB	Output is correct
27	Correct	5 ms	2160 KB	Output is correct
28	Correct	4 ms	2160 KB	Output is correct
29	Correct	4 ms	2160 KB	Output is correct
30	Correct	5 ms	2160 KB	Output is correct
31	Correct	4 ms	2160 KB	Output is correct
32	Correct	3 ms	2160 KB	Output is correct
33	Correct	4 ms	2160 KB	Output is correct
34	Correct	5 ms	2160 KB	Output is correct
35	Correct	15 ms	2160 KB	Output is correct
36	Correct	5 ms	2160 KB	Output is correct
37	Correct	4 ms	2160 KB	Output is correct
38	Correct	13 ms	2160 KB	Output is correct
39	Correct	4 ms	2160 KB	Output is correct
40	Correct	3 ms	2212 KB	Output is correct

Subtask #2
0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	5 ms	1912 KB	Output is correct
2	Correct	3 ms	1912 KB	Output is correct
3	Correct	3 ms	1948 KB	Output is correct
4	Correct	3 ms	2028 KB	Output is correct
5	Correct	3 ms	2080 KB	Output is correct
6	Correct	5 ms	2080 KB	Output is correct
7	Correct	4 ms	2096 KB	Output is correct
8	Correct	4 ms	2152 KB	Output is correct
9	Correct	5 ms	2152 KB	Output is correct
10	Correct	4 ms	2152 KB	Output is correct
11	Correct	4 ms	2152 KB	Output is correct
12	Correct	4 ms	2152 KB	Output is correct
13	Correct	5 ms	2152 KB	Output is correct
14	Correct	4 ms	2152 KB	Output is correct
15	Correct	4 ms	2152 KB	Output is correct
16	Correct	4 ms	2152 KB	Output is correct
17	Correct	4 ms	2160 KB	Output is correct
18	Correct	5 ms	2160 KB	Output is correct
19	Correct	4 ms	2160 KB	Output is correct
20	Correct	4 ms	2160 KB	Output is correct
21	Correct	4 ms	2160 KB	Output is correct
22	Correct	4 ms	2160 KB	Output is correct
23	Correct	3 ms	2160 KB	Output is correct
24	Correct	4 ms	2160 KB	Output is correct
25	Correct	4 ms	2160 KB	Output is correct
26	Correct	4 ms	2160 KB	Output is correct
27	Correct	5 ms	2160 KB	Output is correct
28	Correct	4 ms	2160 KB	Output is correct
29	Correct	4 ms	2160 KB	Output is correct
30	Correct	5 ms	2160 KB	Output is correct
31	Correct	4 ms	2160 KB	Output is correct
32	Correct	3 ms	2160 KB	Output is correct
33	Correct	4 ms	2160 KB	Output is correct
34	Correct	5 ms	2160 KB	Output is correct
35	Correct	15 ms	2160 KB	Output is correct
36	Correct	5 ms	2160 KB	Output is correct
37	Correct	4 ms	2160 KB	Output is correct
38	Correct	13 ms	2160 KB	Output is correct
39	Correct	4 ms	2160 KB	Output is correct
40	Correct	3 ms	2212 KB	Output is correct
41	Correct	4 ms	2284 KB	Output is correct
42	Incorrect	4 ms	2284 KB	'impossible' claimed, but there is a solution
43	Halted	0 ms	0 KB	-

Subtask #3
0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Correct	5 ms	1912 KB	Output is correct
2	Correct	3 ms	1912 KB	Output is correct
3	Correct	3 ms	1948 KB	Output is correct
4	Correct	3 ms	2028 KB	Output is correct
5	Correct	3 ms	2080 KB	Output is correct
6	Correct	5 ms	2080 KB	Output is correct
7	Correct	4 ms	2096 KB	Output is correct
8	Correct	4 ms	2152 KB	Output is correct
9	Correct	5 ms	2152 KB	Output is correct
10	Correct	4 ms	2152 KB	Output is correct
11	Correct	4 ms	2152 KB	Output is correct
12	Correct	4 ms	2152 KB	Output is correct
13	Correct	5 ms	2152 KB	Output is correct
14	Correct	4 ms	2152 KB	Output is correct
15	Correct	4 ms	2152 KB	Output is correct
16	Correct	4 ms	2152 KB	Output is correct
17	Correct	4 ms	2160 KB	Output is correct
18	Correct	5 ms	2160 KB	Output is correct
19	Correct	4 ms	2160 KB	Output is correct
20	Correct	4 ms	2160 KB	Output is correct
21	Correct	4 ms	2160 KB	Output is correct
22	Correct	4 ms	2160 KB	Output is correct
23	Correct	3 ms	2160 KB	Output is correct
24	Correct	4 ms	2160 KB	Output is correct
25	Correct	4 ms	2160 KB	Output is correct
26	Correct	4 ms	2160 KB	Output is correct
27	Correct	5 ms	2160 KB	Output is correct
28	Correct	4 ms	2160 KB	Output is correct
29	Correct	4 ms	2160 KB	Output is correct
30	Correct	5 ms	2160 KB	Output is correct
31	Correct	4 ms	2160 KB	Output is correct
32	Correct	3 ms	2160 KB	Output is correct
33	Correct	4 ms	2160 KB	Output is correct
34	Correct	5 ms	2160 KB	Output is correct
35	Correct	15 ms	2160 KB	Output is correct
36	Correct	5 ms	2160 KB	Output is correct
37	Correct	4 ms	2160 KB	Output is correct
38	Correct	13 ms	2160 KB	Output is correct
39	Correct	4 ms	2160 KB	Output is correct
40	Correct	3 ms	2212 KB	Output is correct
41	Correct	4 ms	2284 KB	Output is correct
42	Incorrect	4 ms	2284 KB	'impossible' claimed, but there is a solution
43	Halted	0 ms	0 KB	-

Subtask #4
19.0 / 19.0

#	결과	실행 시간	메모리	Grader output
1	Correct	39 ms	3432 KB	Output is correct
2	Correct	4 ms	3432 KB	Output is correct
3	Correct	18 ms	3432 KB	Output is correct
4	Correct	26 ms	3432 KB	Output is correct
5	Correct	53 ms	3432 KB	Output is correct
6	Correct	40 ms	3432 KB	Output is correct
7	Correct	50 ms	3432 KB	Output is correct
8	Correct	6 ms	3432 KB	Output is correct
9	Correct	6 ms	3432 KB	Output is correct
10	Correct	67 ms	3432 KB	Output is correct
11	Correct	43 ms	3432 KB	Output is correct
12	Correct	43 ms	3432 KB	Output is correct
13	Correct	5 ms	3432 KB	Output is correct
14	Correct	5 ms	3432 KB	Output is correct
15	Correct	65 ms	3588 KB	Output is correct
16	Correct	25 ms	3588 KB	Output is correct
17	Correct	69 ms	3588 KB	Output is correct
18	Correct	62 ms	3640 KB	Output is correct
19	Correct	8 ms	3640 KB	Output is correct
20	Correct	52 ms	3640 KB	Output is correct

Subtask #5
0 / 26.0

#	결과	실행 시간	메모리	Grader output
1	Correct	5 ms	1912 KB	Output is correct
2	Correct	3 ms	1912 KB	Output is correct
3	Correct	3 ms	1948 KB	Output is correct
4	Correct	3 ms	2028 KB	Output is correct
5	Correct	3 ms	2080 KB	Output is correct
6	Correct	5 ms	2080 KB	Output is correct
7	Correct	4 ms	2096 KB	Output is correct
8	Correct	4 ms	2152 KB	Output is correct
9	Correct	5 ms	2152 KB	Output is correct
10	Correct	4 ms	2152 KB	Output is correct
11	Correct	4 ms	2152 KB	Output is correct
12	Correct	4 ms	2152 KB	Output is correct
13	Correct	5 ms	2152 KB	Output is correct
14	Correct	4 ms	2152 KB	Output is correct
15	Correct	4 ms	2152 KB	Output is correct
16	Correct	4 ms	2152 KB	Output is correct
17	Correct	4 ms	2160 KB	Output is correct
18	Correct	5 ms	2160 KB	Output is correct
19	Correct	4 ms	2160 KB	Output is correct
20	Correct	4 ms	2160 KB	Output is correct
21	Correct	4 ms	2160 KB	Output is correct
22	Correct	4 ms	2160 KB	Output is correct
23	Correct	3 ms	2160 KB	Output is correct
24	Correct	4 ms	2160 KB	Output is correct
25	Correct	4 ms	2160 KB	Output is correct
26	Correct	4 ms	2160 KB	Output is correct
27	Correct	5 ms	2160 KB	Output is correct
28	Correct	4 ms	2160 KB	Output is correct
29	Correct	4 ms	2160 KB	Output is correct
30	Correct	5 ms	2160 KB	Output is correct
31	Correct	4 ms	2160 KB	Output is correct
32	Correct	3 ms	2160 KB	Output is correct
33	Correct	4 ms	2160 KB	Output is correct
34	Correct	5 ms	2160 KB	Output is correct
35	Correct	15 ms	2160 KB	Output is correct
36	Correct	5 ms	2160 KB	Output is correct
37	Correct	4 ms	2160 KB	Output is correct
38	Correct	13 ms	2160 KB	Output is correct
39	Correct	4 ms	2160 KB	Output is correct
40	Correct	3 ms	2212 KB	Output is correct
41	Correct	4 ms	2284 KB	Output is correct
42	Incorrect	4 ms	2284 KB	'impossible' claimed, but there is a solution
43	Halted	0 ms	0 KB	-

답안 #63267

Compilation message

Subtask #1 13.0 / 13.0

Subtask #2 0 / 20.0

Subtask #3 0 / 22.0

Subtask #4 19.0 / 19.0

Subtask #5 0 / 26.0

Subtask #1
13.0 / 13.0

Subtask #2
0 / 20.0

Subtask #3
0 / 22.0

Subtask #4
19.0 / 19.0

Subtask #5
0 / 26.0