Submission #419480

#	Time	Username	Problem	Language	Result	Execution time	Memory
419480		juggernaut	Election Campaign (JOI15_election_campaign)	C++17	10 / 100	83 ms	7612 KiB

election_campaign

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
typedef long long ll;
#define USING_ORDERED_SET 0
#if USING_ORDERED_SET
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef IOI2021SG
    #define printl(args...)printf(args)
#else
    #define printl(args...)((void)0)
#endif
int n;
vector<pair<int,int>>g[100005];
int dp[100005],mx[100005];
int m;
int main(){
    scanf("%d",&n);
    for(int i=1,x;i<n;i++)scanf("%d%d",&x,&x);
    scanf("%d",&m);
    while(m--){
        int x,y,z;
        scanf("%d%d%d",&x,&y,&z);
        if(x>y)swap(x,y);
        g[y].emplace_back(x,z);
    }
    for(int i=1;i<=n;i++){
        for(auto to:g[i])umax(dp[i],mx[to.fr-1]+to.sc);
        mx[i]=max(mx[i-1],dp[i]);
    }
    printf("%d",mx[n]);
}

Compilation message (stderr)

election_campaign.cpp: In function 'void usaco(std::string)':
election_campaign.cpp:5:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
election_campaign.cpp:5:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
election_campaign.cpp:26:32: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     for(int i=1,x;i<n;i++)scanf("%d%d",&x,&x);
      |                           ~~~~~^~~~~~~~~~~~~~
election_campaign.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     scanf("%d",&m);
      |     ~~~~~^~~~~~~~~
election_campaign.cpp:30:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         scanf("%d%d%d",&x,&y,&z);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~

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