Compilare: user.cpp: In function ‘int main()’: user.cpp:79:29: warning: operation on ‘L’ may be undefined [-Wsequence-point] NS[++L].x=VE[L].x=x+v1[j]; ^ user.cpp:80:29: warning: operation on ‘L’ may be undefined [-Wsequence-point] NS[++L].y=VE[L].y=y+v2[j]; ^ user.cpp:70:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zc.in","r",stdin); ^ user.cpp:71:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zc.out","w",stdout); ^ user.cpp:72:25: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,1,MAX,stdin); ^