#include <bits/stdc++.h>
using namespace std;
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0);
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define gg exit(0);
#ifndef UNX
#include "vision.h"
#endif
int D[]={-1,-1,1,1};
int C[]={-1,1,1,-1};
const int N=210;
int it;
int id[N][N];
void construct_network(int m, int n, int w){
forinc(i,1,m) forinc(j,1,n) id[i][j]=it++;
ii x={0,0},y;
int z;
forinc(i,1,m) forinc(j,1,n) if(!add_not(id[i][j])){
x=x.fi?x:{i,j};
y={i,j};
} else z=id[i][j];
if(abs(x.fi-y.fi)+abs(x.se-y.se)==w) add_not(z); else add_not(z);
}
Compilation message
vision.cpp: In function 'void construct_network(int, int, int)':
vision.cpp:36:18: error: expected primary-expression before '{' token
x=x.fi?x:{i,j};
^
