#include "rainbow.h"
//#define _GLIBCXX_DEBUG
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
using namespace std;
//#include <ext/pb_ds/assoc_container.hpp>
//
//using namespace __gnu_pbds;
//
//template<typename T>
//using ordered_set = tree<T, null_type, less < T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T>
using normal_queue = priority_queue<T, vector<T>, greater<>>;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
#define trace(x) cout << #x << ": " << (x) << endl;
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define uniq(x) x.resize(unique(all(x)) - begin(x))
#define sz(s) ((int) size(s))
#define pii pair<int, int>
#define mp(x, y) make_pair(x, y)
#define int128 __int128
#define pb push_back
#define popb pop_back
#define eb emplace_back
#define fi first
#define se second
#define itn int
#define int ll
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
typedef double db;
//typedef unsigned int uint;
template<typename T>
bool ckmn(T &x, T y) {
if (x > y) {
x = y;
return true;
}
return false;
}
template<typename T>
bool ckmx(T &x, T y) {
if (x < y) {
x = y;
return true;
}
return false;
}
int bit(int x, int b) {
return (x >> b) & 1;
}
int rand(int l, int r) { return (int) ((ll) rnd() % (r - l + 1)) + l; }
const ll infL = 3e18;
const int infI = 1000000000 + 7;
const int infM = 0x3f3f3f3f; //a little bigger than 1e9
const ll infML = 0x3f3f3f3f3f3f3f3fLL; //4.5e18
struct Fenwick {
unordered_map<int, unordered_map<int, ll>> t;
int n, m;
set<pii > stt;
Fenwick(int a, int b) {
n = a, m = b;
}
Fenwick() = default;
void build(int a, int b) {
n = a, m = b;
}
void add(int x, int y, int val) {
if (stt.count(mp(x, y))) return;
stt.insert(mp(x, y));
for (int i = x; i < n; i |= (i + 1))
for (int j = y; j < m; j |= (j + 1))
t[i][j] += val;
}
ll get(int x, int y) {
ll ans = 0;
for (int i = x; i > -1; i = ((i + 1) & i) - 1)
for (int j = y; j > -1; j = ((j + 1) & j) - 1)
ans += t[i][j];
return ans;
}
ll get(int x1, int y1, int x2, int y2) {
return get(x2, y2) - get(x1 - 1, y2) - get(x2, y1 - 1) + get(x1 - 1, y1 - 1);
}
};
const int dx[4] = {0, 0, 1, -1};
const int dy[4] = {1, -1, 0, 0};
int n, m;
vector<pair<int, int>>
river,
yy;
Fenwick fx, fy, fv, cv;
void init(int R, int C, int sr, int sc, int M, char *S) {
n = R, m = C;
--sr, --sc;
fx.build(n, m), fy.build(n, m), fv.build(n, m), cv.build(n, m);
river = {{sr, sc}};
set<pii > used;
used.insert(mp(sr, sc));
for (int i = 0; i < M; ++i) {
if (S[i] == 'N') --sr;
else if (S[i] == 'S') ++sr;
else if (S[i] == 'W') --sc;
else ++sc;
river.emplace_back(sr, sc);
}
yy = river;
sort(all(yy));
yy.resize(unique(all(yy)) - begin(yy));
auto here = [](int x, int y) -> bool {
auto it = lower_bound(all(yy), mp(x, y));
if (it == end(yy)) return false;
return (*it) == mp(x, y);
};
for (auto [x, y]: yy) {
fv.add(x, y, 1);
for (int i = 0; i < 4; ++i) {
int nx = x + dx[i], ny = y + dy[i];
if (here(nx, ny)) {
if (nx == x) {
fx.add(x, min(ny, y), 1);
} else {
fy.add(min(nx, x), y, 1);
}
}
}
if (here(x + 1, y) && here(x, y + 1) && here(x + 1, y + 1)) {
cv.add(x, y, 1);
}
}
}
int colour(int ar, int ac, int br, int bc) {
int x1 = ar, y1 = ac, x2 = br, y2 = bc;
--x1, --y1;
--x2, --y2;
int C = 1;
ll E = (x2 - x1) * 2 + (y2 - y1) * 2 + fx.get(x1 + 1, y1, x2 - 1, y2 - 1) + fy.get(x1, y1 + 1, x2 - 1, y2 - 1);
assert(E >= 0);
ll V = (x2 - x1 + 1) * 2 + (y2 - y1 - 1) * 2 + fv.get(x1 + 1, y1 + 1, x2 - 1, y2 - 1);
assert(V >= 0);
ll U = cv.get(x1, y1, x2 - 1, y2 - 1);
assert(U >= 0);
ll F = C + 1 + E - V;
assert(F >= 0);
int ans = F - U - 1;
assert(ans >= 0);
return ans;
}
Compilation message
/usr/bin/ld: /tmp/ccuyHSwU.o: in function `main':
grader.cpp:(.text.startup+0xed): undefined reference to `init(int, int, int, int, int, char*)'
/usr/bin/ld: grader.cpp:(.text.startup+0x167): undefined reference to `colour(int, int, int, int)'
collect2: error: ld returned 1 exit status
