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Submission #580309

# Submission time Handle Problem Language Result Execution time Memory
580309 2022-06-21T05:04:09 Z 반딧불(#8355) Event Hopping (BOI22_events) C++17
0 / 100
 1500 ms 56724 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

struct Range{
    int l, r, idx;
    Range(){}
    Range(int l, int r, int idx): l(l), r(r), idx(idx){}
    bool operator<(const Range &nxt)const{
        return l<nxt.l;
    }
};

struct dat{
    int s, x, idx;
    dat(){}
    dat(int s, int x, int idx): s(s), x(x), idx(idx){}
    bool operator<(const dat &r)const{
        return s<r.s;
    }
};

int n, q;
Range arr[100002];
vector<int> link[100002];
int dist[5002][5002];

void bfs(int r){
    queue<pair<int, int> > que;
    que.push(make_pair(r, 0));
    while(!que.empty()){
        int x = que.front().first, d = que.front().second;
        que.pop();
        for(auto y: link[x]){
            if(dist[r][y] != 1e9) continue;
            dist[r][y] = d+1;
            que.push(make_pair(y, d+1));
        }
    }
}

int main(){
    scanf("%d %d", &n, &q);
    for(int i=1; i<=n; i++){
        scanf("%d %d", &arr[i].l, &arr[i].r);
        arr[i].idx = i;
    }
    for(int i=1; i<=n; i++) for(int j=1; j<=n; j++){
        if(i==j) continue;
        if(arr[j].l <= arr[i].r && arr[i].r <= arr[j].r) link[i].push_back(j);
        dist[i][j] = 1e9;
    }
    for(int i=1; i<=n; i++) bfs(1);

    while(q--){
        int l, r;
        scanf("%d %d", &l, &r);
        if(dist[l][r] == 1e9) printf("impossible\n");
        else printf("%d\n", dist[l][r]);
    }
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     scanf("%d %d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
events.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         scanf("%d %d", &arr[i].l, &arr[i].r);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:59:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         scanf("%d %d", &l, &r);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2692 KB Output is correct
2 Execution timed out 1545 ms 55200 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Incorrect 10 ms 10580 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Incorrect 10 ms 10580 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Incorrect 10 ms 10580 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1575 ms 56724 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2692 KB Output is correct
2 Execution timed out 1545 ms 55200 KB Time limit exceeded
3 Halted 0 ms 0 KB -