ccf行车路线

#include<bits/stdc++.h>
using namespace std;
const long long INF = 1e18;
int n,m;
struct node{
int to;
long long cost;
};

struct edge{
int id;
long long cost;
int len;
bool operator < (const edge & a)const {
return cost > a.cost;
}
};

vector<node> G[510][2];
long long d[510];
priority_queue<edge>que;

long long p2(long long a){
return a * a;
}

int solve(){
fill(d,d+n+1,INF);
d[1] = 0;
que.push({1,0,0});
while(!que.empty() ){
edge a = que.top();
que.pop();
int v = a.id;
if(v == n)
break;
if(d[v] < a.cost)
continue;
for(int i=0;i<G[v][0].size();i++){
node e = G[v][0][i];
if(d[e.to] > d[v] + e.cost){
d[e.to] = d[v] + e.cost;
que.push(edge{e.to,d[e.to],0});
}
}
for(int i=0;i<G[v][1].size();i++){
node e = G[v][1][i];
int cost = p2(a.len+e.cost)-p2(a.len);
if(d[e.to] > d[v] + cost){
d[e.to] = d[v] + cost;
que.push(edge{e.to,d[e.to],a.len+e.cost});
}
}
}
return d[n];
}

int main ()
{
scanf("%d %d",&n,&m);
for(int i=1;i<=m;i++){
int t,a,b;
long long c;
scanf("%d %d %d %lld",&t,&a,&b,&c);
G[a][t].push_back({b,c});
G[b][t].push_back({a,c});
}
cout << solve() <<endl;
return 0;
}

　80分的

转载于：https://www.cnblogs.com/Draymonder/p/7966395.html