Submission #1271169

#	Time	Username	Problem	Language	Result	Execution time	Memory
1271169		trandangquang	Long Distance Coach (JOI17_coach)	C++20	71 / 100	13 ms	328 KiB

coach

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

#define foru(i,a,b) for(int i=(a); i<=(b); ++i)
#define ford(i,a,b) for(int i=(a); i>=(b); --i)
#define rep(i,a) for(int i=0; i<(a); ++i)
#define sz(a) (int)(a).size()
#define all(a) (a).begin(),(a).end()
#define bit(s,i) (((s)>>(i))&1)
#define ii pair<int,int>
#define fi first
#define se second
#define pb push_back
#define int long long
#define eb emplace_back
#define ll long long

template <class X, class Y> bool maxi(X &x, Y y){return x<y?x=y,true:false;}
template <class X, class Y> bool mini(X &x, Y y){return x>y?x=y,true:false;}

const int N=2025;

int x,n,m,w,t; ll s[N],dp[N];
ii pas[N];
int can[N];

ll calc(ll d){
    return 1LL * ((x-d)/t + 1) * w;
}

void solve(){
    cin>>x>>n>>m>>w>>t;
    foru(i,1,n) cin>>s[i];
    foru(i,1,m) cin>>pas[i].fi>>pas[i].se;

    sort(pas+1, pas+1+m);

    s[++n]=x;
    memset(can,-1,sizeof(can));
    foru(i,1,n){
        int l=lower_bound(pas+1, pas+1+m, ii(s[i]%t,0)) - pas - 1;
        if(can[l]==-1) can[l]=s[i]/t;
        else mini(can[l], s[i]/t);
    }

    memset(dp,0x3f,sizeof(dp));

    dp[0]=calc(0);
    foru(i,1,m){
        if(can[i]!=-1){
            ll cost=0;
            ford(j,i,1){
                cost+=pas[j].se + calc(pas[j].fi)-calc(pas[j].fi+can[i]*t);
                mini(dp[i],dp[j-1]+cost);
            }
        }
        mini(dp[i], dp[i-1]+calc(pas[i].fi));
    }
    cout<<dp[m]<<'\n';
}

int32_t main(){
    #define task "test"
    if(fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin.tie(0)->sync_with_stdio(0);

    int tc=1; //cin>>tc;
    rep(_,tc){
        solve();
    }
}

Compilation message (stderr)

coach.cpp: In function 'int32_t main()':
coach.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
coach.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 0 / 29