Compilare: main.cpp: In function 'void read()': main.cpp:10:9: warning: unused variable 'x' [-Wunused-variable] 10 | int x,y; | ^ main.cpp:10:11: warning: unused variable 'y' [-Wunused-variable] 10 | int x,y; | ^ main.cpp: In function 'int lee(int)': main.cpp:44:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 44 | if(vi>=1&&vi<=n&&vj>=1&&vj<=n&&d[vi][vj]==-1) | ^