Submission #926017

#	Time	Username	Problem	Language	Result	Execution time	Memory
926017		knon0501	Overtaking (IOI23_overtaking)	C++17	19 / 100	3 ms	15560 KiB

overtaking

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


struct A{
    long long l,r,t,i,j,mx;
    bool operator <(const A& a)const{
        return l<a.l;
    }
};
long long t[1005][1005];
long long dp[1005][1005];

vector<A> a;
long long x;
long long l;
void init(int L, int N, std::vector<long long> T, std::vector<int> W, int X, int M, std::vector<int> S)
{
 
    x=X;
    l = L;
    for(int i=0 ; i<N ; i++){
        t[0][i] = T[i];
     
    }
    for(int i=1 ; i<M ; i++){
        vector<pair<long long,int>> v;
        for(int j=0 ; j<N ; j++){
            v.push_back({t[i-1][j],j});
        }
        sort(v.begin(),v.end(),[&](auto x,auto y){
            if(x.first == y.first)return W[x.second]<W[y.second];
            return x.first<y.first;
        });
        long long mx = 0;
        long long prv = -1;
        for(auto x: v){
            int j = x.second;
           
            t[i][j] = max(mx,t[i-1][j] + (S[i]-S[i-1])*1ll*W[j]);
    
            prv = x.first;
            mx=max(mx,t[i][j]);
            
            a.push_back({t[i-1][j] - X*1ll*S[i-1],t[i][j]+X*1ll*(L-S[i]),t[i][j]+1ll*X*(L-S[i]),i,j});
        
        }
    }
    for(int i=0  ;i<N ;i++)
        dp[M-1][i] = t[M-1][i];
    for(int i=M-2 ; i>= 0 ; i--){
        vector<pair<long long,int>> v;

        for(int j=0 ; j<N; j++)
            v.push_back({t[i][j],j});
        sort(v.begin(),v.end(),[&](auto x,auto y){
            if(x.first == y.first)return W[x.second]<W[y.second];
            return x.first<y.first;
        });

        int k = -1;
        long long prv = -1;
        for(auto x: v){
            int j = x.second;
            if(k==-1 || t[i][j] + 1ll*X*(S[i+1]-S[i]) > t[i+1][k])
                dp[i][j] = t[i][j] + 1ll*X*(L-S[i]);
            else
                dp[i][j] = dp[i+1][k];
            if(k==-1 || t[i+1][j]>t[i+1][k] )k=j;
        }
    }


    sort(a.begin(),a.end());
    a[0].mx = dp[a[0].i][a[0].j];

    for(int i=1 ; i<a.size() ; i++){
        a[i].mx = max(a[i-1].mx,dp[a[i].i][a[i].j]);
    }
    return;
}
 
long long arrival_time(long long Y)
{
    auto k = lower_bound(a.begin(),a.end(),(A){Y,0,0,0});
    if(k == a.begin()){
        return Y+l*x;
    }
    k--;
    return max(Y+l*x,k->mx);
}

Compilation message (stderr)

overtaking.cpp: In function 'void init(int, int, std::vector<long long int>, std::vector<int>, int, int, std::vector<int>)':
overtaking.cpp:37:19: warning: variable 'prv' set but not used [-Wunused-but-set-variable]
   37 |         long long prv = -1;
      |                   ^~~
overtaking.cpp:63:19: warning: unused variable 'prv' [-Wunused-variable]
   63 |         long long prv = -1;
      |                   ^~~
overtaking.cpp:78:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<A>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     for(int i=1 ; i<a.size() ; i++){
      |                   ~^~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 26
• Subtask 5: 0 / 35