Compilare: user.cpp: In function ‘int main()’: user.cpp:43:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind[i] < v[i].size() && v[i][ind[i]] <= high) { ~~~~~~~^~~~~~~~~~~~~ user.cpp:10:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitywar.in", "r", stdin); ^ user.cpp:11:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitywar.out", "w", stdout); ^