Compilare: user.cpp: In function ‘int main()’: user.cpp:24:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st+m<v[s].size() && i-v[s][st+m]<a) ^ user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr+m<v[s].size() && i-v[s][dr+m]<b) ^ user.cpp:7:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.in", "r", stdin); ^ user.cpp:8:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.out", "w", stdout); ^ user.cpp:15:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&k,&a,&b); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^