Submission #46602

#	Time	Username	Problem	Language	Result	Execution time	Memory
46602		Talant	Boat (APIO16_boat)	C++17	0 / 100	2086 ms	544 KiB

boat

#include <bits/stdc++.h>

#define mk make_pair
#define sc second
#define fr first
#define pb emplace_back
#define all(s) s.begin(), s.end()
#define sz(s) ( (int)s.size() )

using namespace std;

const int inf = (int)1e9 + 7;
const int N = (int)2e5 + 7;

int n;
long long ans;
long long a[N],b[N];


main () {
      cin >> n;

      for (int i = 1; i <= n; i ++) {
            cin >> a[i] >> b[i];
      }
      for (int i = n; i >= 1; i --) {
            ans = (ans + (b[i] - a[i] + 1)) % inf;
            if (i == n)
                  continue;
            for (int j = a[i]; j <= b[i]; j ++) {
                  for (int l = i + 1; l <= n; l ++) {
                        ans = (ans + max(b[l] - max(j*1ll + 1,a[l]) + 1,0ll)) % inf;
                  }
            }
      }
      cout << ans << endl;
}

Compilation message (stderr)

boat.cpp:20:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^

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