#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define ii pair<int,int>
const int N = 55;
int grid[N][N];
int rows, cols;
map<char,ii> to = {{'N', {-1, 0}}, {'S', {1, 0}}, {'W', {0, -1}}, {'E', {0, 1}}};
void init(int R, int C, int sr, int sc, int M, char *s){
rows = R;
cols = C;
sr--, sc--;
ii pos = {sr, sc};
grid[pos.first][pos.second] = 1;
for(int i=0; i<M; ++i){
char c = s[i];
pos.first += to[c].first;
pos.second += to[c].second;
grid[pos.first][pos.second] = 1;
}
}
void clear(){
for(int i=0; i<rows; ++i){
for(int j=0; j<cols; ++j){
if(grid[i][j] == 2) grid[i][j] = 0;
}
}
}
vector<ii> mov = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
void dfs(int i, int j, int ar, int ac, int br, int bc){
for(auto tmp : mov){
int ni = i + tmp.first;
int nj = j + tmp.second;
if(ni >= ar && ni <= br && nj >= ac && nj <= bc && grid[ni][nj] == 0){
grid[ni][nj] = 2;
dfs(ni, nj, ar, ac, br, bc);
}
}
}
int colours(int ar, int ac, int br, int bc){
ar--, ac--;
br--, bc--;
int ans = 0;
for(int i=ar; i<=br; ++i){
for(int j=ac; j<=bc; ++j){
if(grid[i][j] == 0){
ans++;
grid[i][j] = 2;
dfs(i, j, ar, ac, br, bc);
}
}
}
clear();
return ans;
}
Compilation message
/usr/bin/ld: /tmp/ccgTYjr6.o: in function `main':
grader.cpp:(.text.startup+0x167): undefined reference to `colour(int, int, int, int)'
collect2: error: ld returned 1 exit status
