Submission #44498

#	Time	Username	Problem	Language	Result	Execution time	Memory
44498		arman_ferdous	Boat (APIO16_boat)	C++17	9 / 100	6 ms	1996 KiB

boat

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

const int N = 510, inf = 2e9, mod = 1e9+7;
int n;
pair<int,int> arr[510];

int dp[510][510];
int dp_9pts(int pos, int prev) {
	if(pos < 0) return 1;
	if(dp[pos][prev] != -1) return dp[pos][prev];
	
	int ret = dp_9pts(pos-1,prev) % mod;
	if(arr[pos].first < arr[prev].first) ret = (ret + dp_9pts(pos-1,pos))%mod;
	return dp[pos][prev] = ret;
}

void pts9() {
	memset(dp,-1,sizeof dp);
	arr[n].first = inf;
	printf("%d\n", dp_9pts(n-1,n) - 1);
}

int main() {
	scanf("%d", &n);
	for(int i = 0; i < n; i++)
		scanf("%d %d", &arr[i].first, &arr[i].second);
	pts9();
	return 0;
}

Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
boat.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &arr[i].first, &arr[i].second);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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