| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 740225 | vjudge1 | Fountain Parks (IOI21_parks) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "parks.h"
#include <bits/stdc++.h>
using namespace std;
static void check(bool cond, string message) {
if (!cond) {
printf("%s\n", message.c_str());
fclose(stdout);
exit(0);
}
}
static int n;
static bool build_called;
static int m;
static vector<int> _u, _v, _a, _b;
void build(vector<int> u, vector<int> v, vector<int> a, vector<int> b) {
check(!build_called, "build is called more than once");
build_called = true;
m = u.size();
check(int(v.size()) == m, "u.size() != v.size()");
check(int(a.size()) == m, "u.size() != a.size()");
check(int(b.size()) == m, "u.size() != b.size()");
_u = u;
_v = v;
_a = a;
_b = b;
}
#include "parks.h"
#include<bits/stdc++.h>
#define f first
#define s second
using namespace std;
const int maxn = 2e5 + 100;
int sum;
int ord[maxn];
int used[maxn];
vector<int>g[maxn];
void dfs(int v){
used[v] = 1;
sum++;
for(auto to: g[v]){
if(!used[to]) dfs(to);
}
}
int construct_roads(std::vector<int> x, std::vector<int> y){
int n = x.size();
if (x.size() == 1) {
build({}, {}, {}, {});
return 1;
}
vector<pair<int, int>>c[2];
for(int i=0; i<n; i++){
int num = 0;
if(x[i] == 4) num = 1;
c[num].push_back({y[i], i});
}
sort(c[0].begin(), c[0].end());
sort(c[1].begin(), c[1].end());
bool ok = 1;
vector<int>u, v, a, b;
if(c[1].size() == 0){
for(int i=1; i<n; i++){
if(c[0][i].first-c[0][i-1].first != 2) ok = 0;
u.push_back(c[0][i-1].second);
v.push_back(c[0][i].second);
a.push_back(1);
b.push_back(c[0][i].first-1);
}
} else{
for(int i=1; i<c[0].size(); i++){
u.push_back(c[0][i-1].second);
v.push_back(c[0][i].second);
a.push_back(1);
b.push_back(c[0][i].first-1);
g[c[0][i].s].push_back(c[0][i-1].s);
g[c[0][i-1].s].push_back(c[0][i].s);
}
for(int i=1; i<c[1].size(); i++){
u.push_back(c[1][i-1].second);
v.push_back(c[1][i].second);
a.push_back(5);
b.push_back(c[1][i].first-1);
g[c[1][i].s].push_back(c[1][i-1].s);
g[c[1][i-1].s].push_back(c[1][i].s);
}
int pos = 0;
for(int i=0; i<c[0].size(); i++){
while(pos < c[1].size() && c[1][pos].f < c[0][i].f) pos++;
if(pos < c[1].size() && c[1][pos].f == c[0][i].f){
u.push_back(c[0][i].s);
v.push_back(c[1][pos].s);
a.push_back(3);
b.push_back(c[0][i].f-1);
g[c[0][i].s].push_back(c[1][pos].s);
g[c[1][pos].s].push_back(c[0][i].s);
}
}
dfs(0);
if(sum < n) ok = 0;
}
if(ok) build(u, v, a, b);
return ok;
}
int main() {
assert(scanf("%d", &n) == 1);
vector<int> x(n), y(n);
for (int i = 0; i < n; i++) {
assert(scanf("%d%d", &x[i], &y[i]) == 2);
}
fclose(stdin);
build_called = false;
const int possible = construct_roads(x, y);
check(possible == 0 || possible == 1, "Invalid return value of construct_roads()");
if (possible == 1) {
check(build_called, "construct_roads() returned 1 without calling build()");
} else {
check(!build_called, "construct_roads() called build() but returned 0");
}
printf("%d\n", possible);
if (possible == 1) {
printf("%d\n", m);
for (int j = 0; j < m; j++) {
printf("%d %d %d %d\n", _u[j], _v[j], _a[j], _b[j]);
}
}
fclose(stdout);
return 0;
}