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ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#710631 | #5458. Shortest Path Query | 123456zmy | TL | 0ms | 4184kb | C++17 | 2.4kb | 2024-11-04 20:46:37 | 2024-11-04 20:46:37 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
long long ans[50011];
int main()
{
memset(ans,0x3f,sizeof(ans));
int n,m;
scanf("%d%d",&n,&m);
// n=50000,m=100000;
vector<vector<pair<int,int>>>to(n+1);
for(int i=1,u,v,w;i<=m;i++)
{
scanf("%d%d%d",&u,&v,&w);
// u=(i+1)/2,v=(i+1)/2+1,w=i&1;
to[v].emplace_back(u,w);
}
int q;
scanf("%d",&q);
// q=50000;
// vector<long long>ans(q+1,0x3f3f3f3f);
vector<vector<pair<pair<int,int>,int>>>query(n+1);
for(int i=1,a,b,x;i<=q;i++)
{
scanf("%d%d%d",&a,&b,&x);
// a=rand()%10000+1,b=rand()%10000+1,x=rand()%n+1;
query[x].push_back({{a,b},i});
}
vector<int>mx(n+1);
vector<vector<pair<int,int>>>dp(n+1);
dp[1].push_back({0,0});
for(int i=2;i<=n;i++)
{
dp[i&1023].clear();
for(auto tmp_:to[i])
{
int u=tmp_.first,w=tmp_.second;
int i_=i&1023,u_=u&1023;
auto cmp=[&](pair<int,int>i,pair<int,int>j,pair<int,int>k)
{
j.first-=i.first,j.second-=i.second;
k.first-=i.first,k.second-=i.second;
return k.first*j.second<j.first*k.second;
};
auto ins=[&](vector<pair<int,int>>&v,pair<int,int>p)
{
if(v.size()&&v.back()==p)v.pop_back();
while(v.size()>2&&cmp(v[v.size()-2],v[v.size()-1],p))v.pop_back();
v.push_back(p);
};
int l=0;
vector<pair<int,int>>dp1;
for(auto&tmp:dp[u_])
{
while(l<dp[i_].size()&&dp[i_][l]<tmp)
ins(dp1,dp[i_][l++]);
ins(dp1,{tmp.first+(w^1),tmp.second+w});
}
while(l<dp[i_].size())ins(dp1,dp[i_][l++]);
dp[i_].swap(dp1);
}
for(auto tmp:query[i])
{
long long a=tmp.first.first,b=tmp.first.second,l=tmp.second;
int i_=i&1023;
for(auto&p:dp[i])ans[l]=min(ans[l],p.first*a+p.second*b);
}
}
for(auto tmp:query[1])ans[tmp.second]=0;
long long anss=0;
for(int i=1;i<=q;i++)//anss^=ans[i];//
printf("%lld\n",ans[i]);
// printf("%d %d\n",anss,clock());
return 0;
}
/*
4 4
1 2 0
1 3 1
2 4 0
3 4 1
3
3 5 2
3 2 4
2 3 4
*/
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 4184kb
input:
4 4 1 2 0 1 3 1 2 4 0 3 4 1 3 3 5 2 3 2 4 2 3 4
output:
3 4 4
result:
ok 3 number(s): "3 4 4"
Test #2:
score: -100
Time Limit Exceeded
input:
50000 100000 1 2 1 2 3 0 3 4 1 4 5 0 5 6 1 6 7 0 7 8 1 8 9 1 9 10 0 10 11 1 11 12 1 12 13 1 13 14 0 14 15 0 15 16 0 16 17 0 17 18 1 18 19 1 19 20 0 20 21 1 21 22 0 22 23 0 23 24 1 24 25 1 25 26 0 26 27 1 27 28 0 28 29 0 29 30 0 30 31 0 31 32 1 32 33 0 33 34 1 34 35 1 35 36 1 36 37 1 37 38 0 38 39 0 ...