Submission #48370

#	Time	Username	Problem	Language	Result	Execution time	Memory
48370		BThero	Boat (APIO16_boat)	C++17	9 / 100	3 ms	636 KiB

boat

// Why am I so stupid? :c
#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair

#define all(x) (x).begin(), (x).end()

#define fi first
#define se second

typedef long long ll;

using namespace std;

const int mod = 1e9+7;

int l[505], r[505];

int dp[505];

int ans;

int n;

void addMod(int &a, int b) {
    a += b;

    if (mod <= a) {
        a -= mod;
    }
}

void solve() {
    scanf("%d", &n);

    for (int i = 1; i <= n; ++i) {
        scanf("%d %d", &l[i], &r[i]);
    }

    for (int i = 1; i <= n; ++i) {
        dp[i] = 1;

        for (int j = 1; j < i; ++j) {
            if (l[j] < l[i]) {
                addMod(dp[i], dp[j]);
            }
        }
    }

    for (int i = 1; i <= n; ++i) {
        addMod(ans, dp[i]);
    }

    printf("%d\n", ans);
}

int main() {
#ifdef BThero
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif // BThero

    int tt = 1;

    while (tt--) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

boat.cpp: In function 'void solve()':
boat.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
boat.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &l[i], &r[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42