0_0_26007904_25868.cpp: In function 'int main()': 0_0_26007904_25868.cpp:58:17: error: redeclaration of 'int siz' int siz = V[tmp].size(); ^ 0_0_26007904_25868.cpp:53:17: note: 'int siz' previously declared here int siz = V[tmp].size(); ^