Submission #26199

#	Time	Username	Problem	Language	Result	Execution time	Memory
26199		gs14004	Snowy Roads (JOI16_snowy)	C++14	100 / 100	22 ms	4192 KiB

Anya

#include "Anyalib.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pi;
 
static int par[505], ia[505], ib[505], dep[505], n;
 
static vector<int> gph[505];
static vector<pi> el;
 
static void dfs(int x, int p){
	for(auto &i : gph[x]){
		if(i == p) continue;
		par[i] = x;
		dep[i] = dep[x] + 1;
		el.push_back(pi(x, i));
		dfs(i, x);
		el.push_back(pi(i, x));
	}
}
 
static int getL;
 
void InitAnya(int N , int A[] , int B[]) {
	n = N;
	memcpy(ia, A, sizeof(int) * (N-1));
	memcpy(ib, B, sizeof(int) * (N-1));
	for(int i=0; i<N-1; i++){
		gph[ia[i]].push_back(ib[i]);
		gph[ib[i]].push_back(ia[i]);
	}
	dfs(0, -1);
}
 
int pchk[505], sum[1005];
 
void Anya(int C[]) {
	for(int i=0; i<n-1; i++){
		Save(i, C[i]);
		if(par[ia[i]] == ib[i]) swap(ia[i], ib[i]);
		pchk[ib[i]] = C[i];
	}
	memset(sum, 0, sizeof(sum));
	for(int i=0; i<el.size(); i++){
		if(dep[el[i].first] < dep[el[i].second]){
			sum[i] = pchk[el[i].second];
		}
		else{
			sum[i] = -pchk[el[i].first];
		}
	}
	for(int i=1; i<=1000; i++) sum[i] += sum[i-1];
	int pnt = n - 1;
	for(int i=19; i<=999; i+=20){
		for(int j=0; j<9; j++){
			Save(pnt++, (sum[i] >> j) & 1);
		}
	}
}

Boris

#include "Borislib.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pi;
 
static int par[505], ia[505], ib[505], dep[505], n;
 
static vector<int> gph[505];
static vector<pi> el;
 
static void dfs(int x, int p){
	for(auto &i : gph[x]){
		if(i == p) continue;
		par[i] = x;
		dep[i] = dep[x] + 1;
		el.push_back(pi(x, i));
		dfs(i, x);
		el.push_back(pi(i, x));
	}
}
 
void InitBoris(int N , int A[] , int B[]) {
	memcpy(ia, A, sizeof(int) * (N-1));
	memcpy(ib, B, sizeof(int) * (N-1));
	n = N;
	for(int i=0; i<N-1; i++){
		gph[A[i]].push_back(B[i]);
		gph[B[i]].push_back(A[i]);
	}
	dfs(0, -1);
}
 
int querya(int x){
	if(x < 0) return 0;
	assert(x % 20 == 19);
	x = 9 * (x / 20) + n-1;
	int ans = 0;
	for(int j=0; j<9; j++){
		ans |= (Ask(x + j) << j);
	}
	return ans;
}
 
int get_pchk(int node){
	for(int i=0; i<n-1; i++){
		if(par[ia[i]] == ib[i]) swap(ia[i], ib[i]);
		if(ib[i] == node) return Ask(i);
	}
	assert(0);
}
 
int queryb(int x){
	if(x >= el.size()) return 0;
	if(dep[el[x].first] < dep[el[x].second]){
		return get_pchk(el[x].second);
	}
	else return -get_pchk(el[x].first);
}
 
int Boris(int city) {
	int gs = 0;
	for(int i=0; i<el.size(); i++){
		if(el[i].second == city){
			gs = i;
			break;
		}
	}
	if(gs % 20 >= 10){
		int up = (gs / 20 + 1) * 20;
		int sum = querya(up - 1);
		for(int i=gs+1; i<up; i++){
			sum -= queryb(i);
		}
		return sum;
	}
	else{
		int up = (gs / 20) * 20;
		int sum = querya(up - 1);
		for(int i=up; i<=gs; i++){
			sum += queryb(i);
		}
		return sum;
	}
}

Compilation message (stderr)

Anya.cpp: In function 'void Anya(int*)':
Anya.cpp:44:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<el.size(); i++){
                ^
Anya.cpp: At global scope:
Anya.cpp:22:12: warning: 'getL' defined but not used [-Wunused-variable]
 static int getL;
            ^

Boris.cpp: In function 'int queryb(int)':
Boris.cpp:53:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(x >= el.size()) return 0;
       ^
Boris.cpp: In function 'int Boris(int)':
Boris.cpp:62:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<el.size(); i++){
                ^

• Subtask 1: 15 / 15
• Subtask 2: 5 / 5
• Subtask 3: 35 / 35
• Subtask 4: 45 / 45