Submission #994709

#	Time	Username	Problem	Language	Result	Execution time	Memory
994709		salmon	Trains (BOI24_trains)	C++14	0 / 100	46 ms	28848 KiB

Main

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

vector<int> v;
set<int> sat[100100];
int N;
int d,x;
vector<pair<int,int>> iv;
long long int num[100100];
long long int mod = 1'000'000'007;
vector<vector<int>> w;
map<int,int> mep;

int main(){
	
	scanf(" %d",&N);
	
	for(int i = 0; i < N; i++){
		scanf(" %d",&d);
		scanf(" %d",&x);
		v.push_back(d);
		iv.push_back({d,x});
		num[i] = 0;
	}
	
	for(int i = 0; i < N; i++){
		if(iv[i].first != 0){
			d = iv[i].first;
			x = iv[i].second;
			for(int j = 1; j <= x && j * d + i < N; j++){
				sat[j * d + i].insert(d);
				if(iv[j * d + i].first == d){
					x = max(x,j + iv[j * d + i].second);
					iv[j * d + i] = {0,0};
				}
			}
		}
	}
	
	num[0] = 1;
	long long int sum = 1;
	
	for(int i = 1; i < N; i++){
		for(int j : sat[i]){
			num[i] += num[i - j];
		}
		num[i] %= mod;
		sum = (sum + num[i]) % mod;
	}
	
	printf("%lld",sum);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  scanf(" %d",&N);
      |  ~~~~~^~~~~~~~~~
Main.cpp:19:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   scanf(" %d",&d);
      |   ~~~~~^~~~~~~~~~
Main.cpp:20:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |   scanf(" %d",&x);
      |   ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 13
• Subtask 3: 0 / 16
• Subtask 4: 0 / 34
• Subtask 5: 0 / 29