Submission #1164209

#	Time	Username	Problem	Language	Result	Execution time	Memory
1164209		son2008	Toll (BOI17_toll)	C++20	0 / 100	83 ms	103236 KiB

toll

#include<bits/stdc++.h>
using namespace std;
#define task "task"
#define ii pair<int,int>
#define fi first
#define se second
//#define int long long
#define ll long long
#define ld double
#define mp make_pair
#define lg2 20
#define iii pair<int,ii>
#define iiii pair<ii,ii>
#define base 29
#define eps 1e-8
int dx[]= {0LL,0LL,1,-1,1,1,-1,-1};
int dy[]= {1,-1,0LL,0LL,1,-1,1,-1};
const int maxn=1e5+5;
const int mod=1e9+7;
int k,m,n,o,dp[50005][lg2+1][5][5],kq[5][5],tmp[5][5];
void xet(int ans[5][5],int a[5][5],int b[5][5])
{
    for(int x=0;x<k;x++)
    {
        for(int y=0;y<k;y++)
        {
            for(int z=0;z<k;z++)
            {
                ans[x][y]=min(ans[x][y],a[x][z]+b[z][y]);
            }
        }
    }
}
void init()
{
    cin>>k>>n>>m>>o;
    memset(dp,0x3f,sizeof(dp));
    while(m--)
    {
        int u,v,w;
        cin>>u>>v>>w;
        dp[u/k][0][u%k][v%k]=w;
    }
    for(int j=1;j<=lg2;j++)
    {
        for(int i=0;i+(1<<j)<=n/k;i++)
        {
            xet(dp[i][j],dp[i][j-1],dp[i+(1<<j)-1][j-1]);
        }
    }
}
void process()
{
    while(o--)
    {
        int a,b;
        cin>>a>>b;
        int x=a/k,y=b/k;
        memset(kq,0x3f,sizeof(kq));
        for(int i=0;i<k;i++)kq[i][i]=0;
        for(int j=lg2;j>=0;j--)
        {
            if(x+(1<<j)<=y)
            {
                memset(tmp,0x3f,sizeof(tmp));
                xet(tmp,kq,dp[x][j]);
                swap(kq,tmp);
                x+=(1<<j);
            }
        }
        if(kq[a%k][b%k]==0x3f3f3f3f)cout<<-1<<'\n';
        else
        cout<<kq[a%k][b%k]<<'\n';
    }
}
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if(fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    init();
    process();
    cerr <<endl<< "TIME : " << clock() * 0.001 << "s" << endl ;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
toll.cpp:84:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44