Submission #46428

#	Time	Username	Problem	Language	Result	Execution time	Memory
46428		RezwanArefin01	Election Campaign (JOI15_election_campaign)	C++17	10 / 100	151 ms	53084 KiB

election_campaign

#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

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

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

const int maxn = 1e5 + 10; 
vector<int> adj[maxn]; 
vector<ii> q[maxn]; 
ll dp[maxn]; int n, m; 

void solve23() {
	for(int i = 1; i <= n; i++) {
		dp[i] = dp[i - 1]; 
		for(auto it : q[i]) {
			dp[i] = max(dp[i], dp[it.first - 1] + it.second);
		}
	}
	printf("%lld\n", dp[n]);
	exit(0);
}
int main(int argc, char const *argv[]) {
#ifdef LOCAL_TESTING
	freopen("in", "r", stdin);
#endif
	scanf("%d", &n);
	bool subtask23 = 1; 
	for(int i = 1; i < n; i++) {
		int u, v; scanf("%d %d", &u, &v);
		subtask23 &= (u == i && v == u + 1); 
		adj[u].push_back(v);
		adj[v].push_back(u);
	}	
	scanf("%d", &m);
	for(int i = 0; i < m; i++) {
		int x, y, c; 
		scanf("%d %d %d", &x, &y, &c);
		if(x > y) swap(x, y);
		q[y].emplace_back(x, c); 
	}
	if(subtask23) solve23(); 
}

Compilation message (stderr)

election_campaign.cpp: In function 'int main(int, const char**)':
election_campaign.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
election_campaign.cpp:32:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int u, v; scanf("%d %d", &u, &v);
             ~~~~~^~~~~~~~~~~~~~~~~
election_campaign.cpp:37:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &m);
  ~~~~~^~~~~~~~~~
election_campaign.cpp:40:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d", &x, &y, &c);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 30
• Subtask 5: 0 / 10
• Subtask 6: 0 / 40