Compilare: user.cpp: In function ‘int main()’: user.cpp:54:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<p[i].size(); j++){ ^ user.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<p[i].size(); j++){ ^ user.cpp:38:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("14-evantai.in","r",stdin); ^ user.cpp:39:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evantai.out","w",stdout); ^ user.cpp:40:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:44:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^