Submission #842669

#	Time	Username	Problem	Language	Result	Execution time	Memory
842669		SUNWOOOOOOOO	Jail (JOI22_jail)	C++17	0 / 100	2 ms	5208 KiB

jail

#include <bits/stdc++.h>
using namespace std;
using pint = array <int, 2>;
const int mxN = 120005;
vector <int> adj[mxN], v1, v2;
pint st[mxN];
int n, m, s1[mxN], s2[mxN];

int solve()
{
    sort(st + 1, st + m + 1);

    for (int i = 1; i <= m; i++){
        if (st[i][0] < st[i][1]) {
            v1.push_back(st[i][1]);
            s1[st[i][0]]++, s1[st[i][1] + 1]--;
        }
        else {
            v2.push_back(st[i][1]);
            s2[st[i][1]]++, s2[st[i][0] + 1]--;
        }
    }

    for (int i = 0; i < (int) v1.size() - 1; i++) if (v1[i] > v1[i + 1]) return 0;
    for (int i = 0; i < (int) v2.size() - 1; i++) if (v2[i] > v2[i + 1]) return 0;
    for (int i = 1; i <= n; i++) s1[i] += s1[i - 1];
    for (int i = 1; i <= n; i++) s2[i] += s2[i - 1];
    for (int i = 1; i <= n; i++) if (s1[i] && s2[i]) return 0;

    return 1;
}

int main()
{
    int q;
    scanf("%d", &q);
    while (q--) {
        scanf("%d", &n);
        for (int i = 1; i <= n; i++) { // init
            adj[i].clear();
            s1[i] = 0, s2[i] = 0;
        }
        for (int i = 0, a, b; i < n - 1; i++){
            scanf("%d %d", &a, &b);
            adj[a].push_back(b);
            adj[b].push_back(a);
        }
        scanf("%d", &m);
        for (int i = 1; i <= m; i++) {
            scanf("%d %d", &st[i][0], &st[i][1]);
        }
        if (solve()) printf("YES\n");
        else printf("NO\n");
    }

    return 0;
}

Compilation message (stderr)

jail.cpp: In function 'int main()':
jail.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
jail.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
jail.cpp:44:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |             scanf("%d %d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~~
jail.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         scanf("%d", &m);
      |         ~~~~~^~~~~~~~~~
jail.cpp:50:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |             scanf("%d %d", &st[i][0], &st[i][1]);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23