Compilare: user.cpp: In function ‘void add_last()’: user.cpp:71:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k + 1 < aux.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:108:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < norm.size(); i++) go[norm[i].second] = i + 1; ^ user.cpp:125:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == good.size()) { ^ user.cpp:130:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k < good.size()) { ^ user.cpp:158:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < cicl.size(), cicl[i].size() <= k; i++) { ^ user.cpp:158:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < cicl.size(), cicl[i].size() <= k; i++) { ^ user.cpp:158:19: warning: value computed is not used [-Wunused-value] for (i = 0; i < cicl.size(), cicl[i].size() <= k; i++) { ^ user.cpp:93:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ksort.in","r",stdin); ^ user.cpp:94:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ksort.out","w",stdout); ^ user.cpp:96:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); kk = k; ^ user.cpp:98:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &go[i]); ^