Compilare: main.cpp: In function 'int32_t main()': main.cpp:19:26: warning: unused variable 'ax1' [-Wunused-variable] 19 | for (int x, y, c, d, ax1, ax2; m; m--) | ^~~ main.cpp:19:31: warning: unused variable 'ax2' [-Wunused-variable] 19 | for (int x, y, c, d, ax1, ax2; m; m--) | ^~~ main.cpp: In function 'bool dijkstra()': main.cpp:98:25: warning: unused variable 're' [-Wunused-variable] 98 | for (int ax = sink, re, pr; ax != source; ax = pre[ax]) | ^~ main.cpp:98:29: warning: unused variable 'pr' [-Wunused-variable] 98 | for (int ax = sink, re, pr; ax != source; ax = pre[ax]) | ^~