Compilare: user.cpp: In function ‘int solve(int)’: user.cpp:19:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,ok=1,nr,lx,ly; ^ user.cpp:19:23: warning: variable ‘lx’ set but not used [-Wunused-but-set-variable] int i,j,n,ok=1,nr,lx,ly; ^ user.cpp: In function ‘int main()’: user.cpp:73:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<L.size()&&ok;j++) ^ user.cpp:83:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L.size();i++){ ^ user.cpp:65:19: warning: unused variable ‘fd’ [-Wunused-variable] int i,j,ok,fs,fd,num=0; ^ user.cpp:66:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(iN); ^ user.cpp:67:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(ouT); ^ user.cpp:68:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:70:42: 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]); ^