Submission #287591

#	Time	Username	Problem	Language	Result	Execution time	Memory
287591		Namnamseo	Toll (APIO13_toll)	C++17	0 / 100	2 ms	2940 KiB

toll

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <algorithm>
#include <numeric>
#include <cstring>
#include <vector>
#include <cstdio>
using namespace std;
using ll=long long;
#define rep(i,n) for(int i=0;i<n;++i)
#define rrep(i,n) for(int i=1;i<=n;++i)
#define pb push_back
#define eb emplace_back

int n, m, k;

char *I;
int ri() { int ret=0; while (*I<48||*I>=58) ++I; while(*I>=48&&*I<58) ret=ret*10+(*(I++)-48); return ret; }
char Y[20];

struct E { int a, b, c; bool operator<(const E& r)const{ return c<r.c; } } e0[300010], ek[20], eu[300010], et[500]; int eun, etn;
struct UF { int p[100010]; void init(int s=n){iota(p+1,p+s+1,1);} int r(int x){return x==p[x]?x:(p[x]=r(p[x])); }
int join(int a,int b){ a=r(a);b=r(b); if(a==b) return 0;p[a]=b;return 1; }} uf, uf2, ufk;
int q[300010];

ll A;
int g[100010],r[100010],gn;
ll u[100010];
E md[50][50];

using pp=pair<int,int>;
vector<E> G[50];
vector<pp> T[100010];
int D[100010], P[20][100010];
ll F[100010];

ll s[100010];

ll dfs(int x){
	ll ret=u[x]*F[x];
	s[x]=u[x];
	for(auto [y,d]:T[x]) if(P[0][x]!=y) {
		D[y]=D[x]+1;
		F[y]=F[x]+d;
		P[0][y]=x;
		ret+=dfs(y);
		s[x]+=s[y];
	}
	return ret;
}

int lca(int a,int b){
	if(D[a]>D[b])swap(a,b);
	for(int df=D[b]-D[a],i=19;0<=i;--i)if(1&(df>>i))b=P[i][b];
	if(a==b)return a;
	for(int i=19;0<=i;--i)if(P[i][a]!=P[i][b])a=P[i][a],b=P[i][b];
	return P[0][a];
}

ll dist(int a,int b){return F[a]+F[b]-2*F[lca(a,b)];}
ll C[100010];int L;

void l(int x){
	for(auto[y,d]:T[x]) {
		if(P[0][y]==x) {
			C[y]=C[x]-d*1ll*s[y]+d*1ll*(L-s[y]);
			l(y);
		}
	}
}

bool V[50]; ll S[50];

ll yd(int x, int j){
	V[x]=1;
	ll ret=0;
	S[x]=s[r[x]];
	for(auto&z:G[x]){
		int y = z.a, gy = g[y], h = z.b, d = z.c;
		bool isk = 0;
		if (d < 0) isk = 1, d=-d;
		if (V[gy]) continue;
		ret += yd(gy, y);
		if (isk) ret += S[gy] * (dist(j, h)+d);
		S[x] += S[y];
	}
	V[x]=0;
	return ret;
}

void ae(int a, int b, int c) {
	G[g[a]].pb({b, a, c});
	G[g[b]].pb({a, b, c});
}

int main() {
	setbuf(stdout, 0);

	{ static char buf[100]; using Z=struct stat*; fstat(0, (Z)buf); I=(char*)mmap(0,Z(buf)->st_size,1,2,0,0);}
	n = ri(); m = ri(); k = ri();
	rep(i,m) e0[i].a=ri(), e0[i].b=ri(), e0[i].c=ri();
	rep(i,k) ek[i].a=ri(), ek[i].b=ri();
	rrep(i,n) u[i]=ri();

	uf.init(); uf2.init(); rep(i,k) uf.join(ek[i].a,ek[i].b);
	iota(q,q+m,0); sort(q,q+m,[&](const int&a,const int&b){ return e0[a]<e0[b]; });

	rep(i,m) {
		auto&e=e0[q[i]];
		if (uf.join(e.a, e.b)) {
			uf2.join(e.a, e.b);
			T[e.a].eb(e.b, e.c);
			T[e.b].eb(e.a, e.c);
		} else {
			eu[eun++]=e;
		}
	}

	rrep(i,n) if (uf2.p[i]==i) r[g[i]=++gn]=i;
	rrep(i,n) if (uf2.p[i]!=i) g[i]=g[uf2.r(i)];

	memset(md,0x7f,sizeof(md));
	rep(i,eun){
		int a=g[eu[i].a], b=g[eu[i].b];
		if (a != b) md[b][a]=md[a][b]=min(md[a][b], eu[i]);
	}

	rrep(i, gn) C[r[i]] = dfs(r[i]);
	rrep(i, 19) rrep(j, n) P[i][j]=P[i-1][P[i-1][j]];
	rrep(i, gn) L = s[r[i]], l(r[i]);

	ll O = 0;

	rep(m,(1<<k)) {
		ufk.init(gn);
		bool mf=0;

		rep(j,k) if (1&(m>>j)) {
			auto &e = ek[j];
			int a=e.a, b=e.b;
			if(g[a]==g[b] || !ufk.join(g[a],g[b])){ mf=1; break; }
		}
		if (mf) continue;

		rep(j,k) if (1&(m>>j)){
			auto &e = ek[j]; ae(e.a, e.b, -md[g[e.a]][g[e.b]].c);
		}

		etn=0;
		rrep(x, gn) rrep(y, x-1) if(ufk.r(x) != ufk.r(y))
			et[etn++] = md[x][y];

		sort(et,et+etn);

		rep(j, etn){
			int a=et[j].a, b=et[j].b, c=et[j].c;
			if(ufk.join(a, b)) ae(a, b, c);
		}

		O=max(O, yd(g[1], 1));
		rrep(x, gn) G[x].clear();
	}

	for(gn=0,O+=A;!gn||O;)Y[gn++]=48+O%10, O/=10;reverse(Y,Y+gn);Y[gn]=10;write(1,Y,gn+1);

	return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:166:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  166 |  for(gn=0,O+=A;!gn||O;)Y[gn++]=48+O%10, O/=10;reverse(Y,Y+gn);Y[gn]=10;write(1,Y,gn+1);
      |  ^~~
toll.cpp:166:47: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  166 |  for(gn=0,O+=A;!gn||O;)Y[gn++]=48+O%10, O/=10;reverse(Y,Y+gn);Y[gn]=10;write(1,Y,gn+1);
      |                                               ^~~~~~~
toll.cpp:166:77: warning: ignoring return value of 'ssize_t write(int, const void*, size_t)', declared with attribute warn_unused_result [-Wunused-result]
  166 |  for(gn=0,O+=A;!gn||O;)Y[gn++]=48+O%10, O/=10;reverse(Y,Y+gn);Y[gn]=10;write(1,Y,gn+1);
      |                                                                        ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 22
• Subtask 5: 0 / 22