Compilare: user.cpp: In function ‘void pre()’: user.cpp:91:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j < aux.size(); j++) { ^ user.cpp:104:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ord.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:111:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("klsecv.in","r",stdin); ^ user.cpp:112:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("klsecv.out","w",stdout); ^ user.cpp:114:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &t); ^ user.cpp:117:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s + 1); n = strlen(s + 1); ^ user.cpp:118:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &q); Q.clear(); ^ user.cpp:120:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &l, &k); ^