Compilare: main.cpp: In function 'void Substring(int, int, int)': main.cpp:42:36: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] Tree[vertex]={ans,start,lenght}; ^ main.cpp: In function 'void INIT(int, int, int)': main.cpp:42:36: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] Tree[vertex]={ans,start,lenght}; ^ main.cpp:19:20: note: 'start' was declared here int which=left,start,lg=0,lenght=0; ^~~~~