Compilare: main.cpp: In function 'void Read()': main.cpp:28:7: warning: unused variable 'last_l' [-Wunused-variable] int last_l, last_c; ^~~~~~ main.cpp:28:15: warning: unused variable 'last_c' [-Wunused-variable] int last_l, last_c; ^~~~~~ main.cpp: In function 'void Do()': main.cpp:190:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if( L1 == L2 ) ^~ main.cpp:194:7: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if( C1 == C2 ) ^~ main.cpp:190:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if( L1 == L2 ) ^ main.cpp:194:9: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if( C1 == C2 ) ^