Compilare: main.cpp: In function 'int liniiArie(std::vector<int>)': main.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<l.size();i++) ~^~~~~~~~~ main.cpp:67:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l.size();i++) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:158:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bmatrix.in","r",stdin); ^ main.cpp:159:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bmatrix.out","w",stdout); ^