Compilare: user.cpp: In function ‘int main()’: user.cpp:61:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < list[i].size(); j++) { ^ user.cpp:47:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n%s", &K, s); ^ user.cpp:74:35: 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); ^