Compilare: main.cpp: In function 'int main()': main.cpp:89:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size() && p2 < v[road[idx]].size()){ ~~~^~~~~~~~~~~~~~~~~ main.cpp:89:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size() && p2 < v[road[idx]].size()){ ~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:104:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size()){ ~~~^~~~~~~~~~~~~~~~~ main.cpp:113:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p2 < v[road[idx]].size()){ ~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:52:37: 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); ^