Compilare: user.cpp: In function ‘int main()’: user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<L.size()&&ok;j++) ^ user.cpp:19:16: warning: unused variable ‘fs’ [-Wunused-variable] int i,j,ok,fs,fd; ^ user.cpp:19:19: warning: unused variable ‘fd’ [-Wunused-variable] int i,j,ok,fs,fd; ^ user.cpp:20:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(iN); ^ user.cpp:21:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(ouT); ^ user.cpp:22:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:24:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x[i],&y[i],&r[i]); ^