Submission #1279819

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279819		icebear	Passport (JOI23_passport)	C++20	0 / 100	977 ms	74276 KiB

passport

// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"
/*END OF TEMPLATE. ICEBEAR AND THE CAT WILL WIN VOI26 */

const int MOD = 1e9 + 7;
const int inf = 0x3f3f3f3f;
const ll INF = 1e18 + 27092008;
const int N = 2500 + 5;
int n, f[N][N], l[N], r[N];
int mx[N][N], mn[N][N];

int dp(int s) {
    memset(f, 0x3f, sizeof f);
    f[l[s]][r[s]] = 1;
    FORR(i, l[s], 1) FOR(j, r[s], n) {
        minimize(f[mn[i][j]][mx[i][j]], f[i][j] + 1);
    }
    return f[1][n];
}

void init(void) {
    cin >> n;
    FOR(i, 1, n) cin >> l[i] >> r[i];
}

void process(void) {
    memset(mn, 0x3f, sizeof mn);
    FOR(i, 1, n) FOR(j, i, n) {
      mx[i][j] = max(mx[i][j - 1], r[j]);
      mn[i][j] = min(mn[i][j - 1], l[j]);
    }
    int q;
    cin >> q;
    while(q--) {
        int x; cin >> x;
        int ans = dp(x);
        cout << (ans == inf ? -1 : ans) << '\n';
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
        init();
        process();
    }
    return 0;
}

Compilation message (stderr)

passport.cpp: In function 'int main()':
passport.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
passport.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46