#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")
#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 101001
#define M ll(998244353)
#define inf 1e9 + 1e9
using namespace std;
//using namespace __gnu_pbds;
typedef long double ld;
typedef long long ll;
typedef short int si;
typedef array <int, 3> a3;
//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
vector <pair <int, int> > vr;
int main()
{
//freopen("input.txt", "r", stdin); //freopen("output4.txt", "w", stdout);
ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int a, b, c, d;
cin >> a >> b >> c >> d;
if (c + d == 0)
{
int x = 0, y = 0;
cout << 0 << " " << 0 << endl;
for (int i = 0; i < a / 2; i++) {x++; cout << x << " " << y << endl;}
y++; cout << x << " " << y << endl;
for (int i = 0; i < a / 2 - 1; i++) {x--; cout << x << " " << y << endl;}
for (int i = 0; i < b / 2 - 1; i++) {y++; cout << x << " " << y << endl;}
x--; cout << x << " " << y << endl;
for (int i = 0; i < b / 2 - 1; i++) {y--; cout << x << " " << y << endl;}
exit(0);
}
else if (a + b == 0)
{
cout << 0 << " " << 0 << endl;
int x = 0, y = 0;
for (int i = 0; i < c / 2; i++)
{
x++; y++;
cout << x << " " << y << endl;
}
x--; y++;
cout << x << " " << y << endl;
for (int i = 0; i < c / 2 - 1; i++)
{
x--; y--;
cout << x << " " << y << endl;
}
for (int i = 0; i < d / 2 - 1; i++)
{
x--; y++;
cout << x << " " << y << endl;
}
x--; y--;
cout << x << " " << y << endl;
for (int i = 1; i < d / 2; i++)
{
x++; y--;
cout << x << " " << y << endl;
}
exit(0);
}
else
{
bool f1 = 0, f2 = 0;
if (a == 0) {f1 = 0; swap(a, b);}
if (c == 0) {f2 = 0; swap(c, d);}
if (c != 0 && d != 0 && c%2 == 0) {f2 = 0; swap(c, d);}
int x = 0, y = 0;
if (a % 2 == 0 && b % 2 == 0 && c % 2 == 0 && d % 2 == 0)
{
for (int i = 0; i < a / 2; i++) {vr.pb({x, y});x++; }
vr.pb({x, y});
x++; y++;
for (int i = 0; i < b / 2; i++) {vr.pb({x, y});y++; }
for (int i = 0; i < c / 2 - 1; i++) {vr.pb({x, y}); x++; y++; }
for (int i = 0; i < d / 2; i++) {vr.pb({x, y});x--; y++; }
vr.pb({x, y});
x--;
for (int i = 0; i < d / 2; i++){vr.pb({x, y});x++; y--; }
for (int i = 0; i < c / 2 - 1; i++) {vr.pb({x, y});x--; y--; }
for (int i = 0; i < b / 2; i++) {vr.pb({x, y});y--; }
for (int i = 0; i < a / 2 - 1; i++) {vr.pb({x, y});x--; }
vr.pb({x, y});
x--; y--;
} else if (a % 2 == 0 && b % 2 == 0 && c % 2 == 1 && d % 2 == 1)
{
for (int i = 0; i < (a - 2) / 2; i++) {vr.pb({x, y});x++; }
vr.pb({x, y});
x++; y++;
for (int i = 0; i < b / 2; i++) {vr.pb({x, y});y++; }
for (int i = 0; i < (c - 1) / 2; i++) { vr.pb({x, y});x++; y++; }
for (int i = 0; i < (d - 1) / 2; i++) {vr.pb({x, y});x--; y++; }
vr.pb({x, y});
x--;
for (int i = 0; i < (d - 1) / 2; i++){vr.pb({x, y});x++; y--; }
for (int i = 0; i < (c - 1) / 2; i++) {vr.pb({x, y});x--; y--; }
for (int i = 0; i < b / 2; i++) {vr.pb({x, y});y--; }
for (int i = 0; i < (a - 2) / 2; i++) {vr.pb({x, y});x--; }
vr.pb({x, y});
x--;
vr.pb({x, y});
x++; y--;
} else if (a % 2 == 1 && b % 2 == 1 && c % 2 == 1 && d % 2 == 0)
{
for (int i = 0; i < (a - 1) / 2; i++) {vr.pb({x, y});x++; }
vr.pb({x, y});
x++; y++;
for (int i = 0; i < (b - 1) / 2; i++) {vr.pb({x, y});y++; }
for (int i = 0; i < (c - 1) / 2; i++) {vr.pb({x, y}); x++; y++; }
for (int i = 0; i < d / 2; i++) {vr.pb({x, y});x--; y++; }
vr.pb({x, y});
x--;
for (int i = 0; i < d / 2; i++){vr.pb({x, y});x++; y--; }
for (int i = 0; i < (c - 1) / 2; i++) {vr.pb({x, y});x--; y--; }
for (int i = 0; i < (b - 1) / 2; i++) {vr.pb({x, y});y--; }
for (int i = 0; i < (a - 1) / 2; i++) {vr.pb({x, y});x--; }
vr.pb({x, y});
y--;
}
}
if (f1) for (int i = 0; i < sz(vr); i++) swap(vr[i].F, vr[i].S);
if (f2) for (int i = 0; i < sz(vr); i++) vr[i].S = -vr[i].S;
for (auto it : vr) cout << it.F << " " << it.S << endl;
}
Compilation message
pick.cpp: In function 'int main()':
pick.cpp:108:14: warning: variable 'f1' set but not used [-Wunused-but-set-variable]
bool f1 = 0, f2 = 0;
^~
pick.cpp:108:22: warning: variable 'f2' set but not used [-Wunused-but-set-variable]
bool f1 = 0, f2 = 0;
^~
pick.cpp:219:9: error: 'f1' was not declared in this scope
if (f1) for (int i = 0; i < sz(vr); i++) swap(vr[i].F, vr[i].S);
^~
pick.cpp:219:9: note: suggested alternative: 'y1'
if (f1) for (int i = 0; i < sz(vr); i++) swap(vr[i].F, vr[i].S);
^~
y1
pick.cpp:221:9: error: 'f2' was not declared in this scope
if (f2) for (int i = 0; i < sz(vr); i++) vr[i].S = -vr[i].S;
^~
