Compilare: main.cpp: In function 'int main()': main.cpp:101:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size() && p2 < v[road[i]].size()){ ~~~^~~~~~~~~~~~~~~~~ main.cpp:101:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size() && p2 < v[road[i]].size()){ ~~~^~~~~~~~~~~~~~~~~~~ main.cpp:116:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size()){ ~~~^~~~~~~~~~~~~~~~~ main.cpp:125:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p2 < v[road[i]].size()){ ~~~^~~~~~~~~~~~~~~~~~~ main.cpp:53:19: warning: unused variable 'vecin' [-Wunused-variable] int nod , j , vecin , sol , p1 , p2; ^~~~~ main.cpp:54:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff , 1 , 1000000 , fin); ^