Compilare: user.cpp: In function ‘int main()’: user.cpp:2:239: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int nr,nod,n,i,x,a[100009],nxt[100009];void cut(int i){if(a[i]==0) return ;if(a[nxt[i]]>0)cut(nxt[i]);else{nxt[i]=nxt[nxt[i]];a[i]--;nr++;printf("%d %d\n",i,nxt[i]);cut(i-1);}}int main(){freopen("romania.in","r",stdin);freopen("romania.out","w",stdout);scanf("%d%d",&nod,&n);for(i=1;i<=n;i++){scanf("%d",&x);a[x]++;}for(i=1;i<=nod;i++){nxt[i]=i+1;}nxt[nod]=1;i=1;while(1){if(a[i]>0)cut(i);i=nxt[i];if(nr==n) break;}return 0;} ^ user.cpp:2:273: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int nr,nod,n,i,x,a[100009],nxt[100009];void cut(int i){if(a[i]==0) return ;if(a[nxt[i]]>0)cut(nxt[i]);else{nxt[i]=nxt[nxt[i]];a[i]--;nr++;printf("%d %d\n",i,nxt[i]);cut(i-1);}}int main(){freopen("romania.in","r",stdin);freopen("romania.out","w",stdout);scanf("%d%d",&nod,&n);for(i=1;i<=n;i++){scanf("%d",&x);a[x]++;}for(i=1;i<=nod;i++){nxt[i]=i+1;}nxt[nod]=1;i=1;while(1){if(a[i]>0)cut(i);i=nxt[i];if(nr==n) break;}return 0;} ^ user.cpp:2:295: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int nr,nod,n,i,x,a[100009],nxt[100009];void cut(int i){if(a[i]==0) return ;if(a[nxt[i]]>0)cut(nxt[i]);else{nxt[i]=nxt[nxt[i]];a[i]--;nr++;printf("%d %d\n",i,nxt[i]);cut(i-1);}}int main(){freopen("romania.in","r",stdin);freopen("romania.out","w",stdout);scanf("%d%d",&nod,&n);for(i=1;i<=n;i++){scanf("%d",&x);a[x]++;}for(i=1;i<=nod;i++){nxt[i]=i+1;}nxt[nod]=1;i=1;while(1){if(a[i]>0)cut(i);i=nxt[i];if(nr==n) break;}return 0;} ^ user.cpp:2:328: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int nr,nod,n,i,x,a[100009],nxt[100009];void cut(int i){if(a[i]==0) return ;if(a[nxt[i]]>0)cut(nxt[i]);else{nxt[i]=nxt[nxt[i]];a[i]--;nr++;printf("%d %d\n",i,nxt[i]);cut(i-1);}}int main(){freopen("romania.in","r",stdin);freopen("romania.out","w",stdout);scanf("%d%d",&nod,&n);for(i=1;i<=n;i++){scanf("%d",&x);a[x]++;}for(i=1;i<=nod;i++){nxt[i]=i+1;}nxt[nod]=1;i=1;while(1){if(a[i]>0)cut(i);i=nxt[i];if(nr==n) break;}return 0;} ^