Compilare: main.cpp: In function 'int ec1()': main.cpp:21:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < a.size() ) ~~^~~~~~~~~~ main.cpp:26:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int ec2()': main.cpp:40:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < a.size() ) ~~^~~~~~~~~~ main.cpp:44:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if( del >= 0 ) ^ main.cpp:55:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^