vision.cpp: In function 'void construct_network(int, int, int)':
vision.cpp:4:50: warning: unused variable 'op' [-Wunused-variable]
4 | void construct_network(int H, int W, int K) {int op = 0;vector <int> row, col;vector <int> bits;vector <int> v;for (int i = 0; i < H; i++){for (int j = 0; j < W; j++){v.push_back(i * W + j);}bits.push_back(add_xor(v));v = {bits.back()};}for (int j = 0; j < W; j++){for (int i = 0; i < H; i++){v.push_back(i * W + j);}bits.push_back(add_xor(v));v = {bits.back()};}int last = bits.back(); vector <int> rs;for (int i = 0; i < 9; i++){rs.push_back(add_xor(bits));if (K & (1 << i))rs[i] = add_not(rs[i]);vector <int> hl;int now = last;for (int i: bits) {hl.push_back(add_and({now, i}));now = add_xor({now, i});}bits = hl;}add_not(add_or(rs));}
| ^~