Compilare: main.cpp: In function 'int main()': main.cpp:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<(*news[0]).size();j++) ~^~~~~~~~~~~~~~~~~~ main.cpp:34:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("blis.in","r",stdin); ^ main.cpp:35:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("blis.out","w",stdout); ^ main.cpp:36:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ main.cpp:37:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",c); ^