Compilare: user.cpp: In function ‘int main()’: user.cpp:5:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("hacker3.in","r",stdin);freopen("hacker3.out","w",stdout);int n,x,y,ct;scanf("%d",&n);ct=n/2;long long rez;int a[ct+5];int b[ct+5];for(int i=1;i<=n;i++){scanf("%d%d",&x,&y);if(i>ct){a[i-ct]=x;b[i-ct]=y;}}if(n%2==1){rez=min(b[ct+1],a[ct+1]);for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}else{rez=min(b[ct],a[ct]);for(int i=ct-1;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}b[ct+1]=rez;fclose(stdin);freopen("hacker3.in","r",stdin);scanf("%d",&n);for(int i=1;i<=ct;i++){scanf("%d%d",&a[i],&b[i]);}for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}printf("%lld",rez);} ^ user.cpp:5:67: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("hacker3.in","r",stdin);freopen("hacker3.out","w",stdout);int n,x,y,ct;scanf("%d",&n);ct=n/2;long long rez;int a[ct+5];int b[ct+5];for(int i=1;i<=n;i++){scanf("%d%d",&x,&y);if(i>ct){a[i-ct]=x;b[i-ct]=y;}}if(n%2==1){rez=min(b[ct+1],a[ct+1]);for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}else{rez=min(b[ct],a[ct]);for(int i=ct-1;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}b[ct+1]=rez;fclose(stdin);freopen("hacker3.in","r",stdin);scanf("%d",&n);for(int i=1;i<=ct;i++){scanf("%d%d",&a[i],&b[i]);}for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}printf("%lld",rez);} ^ user.cpp:5:95: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("hacker3.in","r",stdin);freopen("hacker3.out","w",stdout);int n,x,y,ct;scanf("%d",&n);ct=n/2;long long rez;int a[ct+5];int b[ct+5];for(int i=1;i<=n;i++){scanf("%d%d",&x,&y);if(i>ct){a[i-ct]=x;b[i-ct]=y;}}if(n%2==1){rez=min(b[ct+1],a[ct+1]);for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}else{rez=min(b[ct],a[ct]);for(int i=ct-1;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}b[ct+1]=rez;fclose(stdin);freopen("hacker3.in","r",stdin);scanf("%d",&n);for(int i=1;i<=ct;i++){scanf("%d%d",&a[i],&b[i]);}for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}printf("%lld",rez);} ^ user.cpp:5:182: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("hacker3.in","r",stdin);freopen("hacker3.out","w",stdout);int n,x,y,ct;scanf("%d",&n);ct=n/2;long long rez;int a[ct+5];int b[ct+5];for(int i=1;i<=n;i++){scanf("%d%d",&x,&y);if(i>ct){a[i-ct]=x;b[i-ct]=y;}}if(n%2==1){rez=min(b[ct+1],a[ct+1]);for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}else{rez=min(b[ct],a[ct]);for(int i=ct-1;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}b[ct+1]=rez;fclose(stdin);freopen("hacker3.in","r",stdin);scanf("%d",&n);for(int i=1;i<=ct;i++){scanf("%d%d",&a[i],&b[i]);}for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}printf("%lld",rez);} ^ user.cpp:5:443: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("hacker3.in","r",stdin);freopen("hacker3.out","w",stdout);int n,x,y,ct;scanf("%d",&n);ct=n/2;long long rez;int a[ct+5];int b[ct+5];for(int i=1;i<=n;i++){scanf("%d%d",&x,&y);if(i>ct){a[i-ct]=x;b[i-ct]=y;}}if(n%2==1){rez=min(b[ct+1],a[ct+1]);for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}else{rez=min(b[ct],a[ct]);for(int i=ct-1;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}b[ct+1]=rez;fclose(stdin);freopen("hacker3.in","r",stdin);scanf("%d",&n);for(int i=1;i<=ct;i++){scanf("%d%d",&a[i],&b[i]);}for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}printf("%lld",rez);} ^ user.cpp:5:458: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("hacker3.in","r",stdin);freopen("hacker3.out","w",stdout);int n,x,y,ct;scanf("%d",&n);ct=n/2;long long rez;int a[ct+5];int b[ct+5];for(int i=1;i<=n;i++){scanf("%d%d",&x,&y);if(i>ct){a[i-ct]=x;b[i-ct]=y;}}if(n%2==1){rez=min(b[ct+1],a[ct+1]);for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}else{rez=min(b[ct],a[ct]);for(int i=ct-1;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}b[ct+1]=rez;fclose(stdin);freopen("hacker3.in","r",stdin);scanf("%d",&n);for(int i=1;i<=ct;i++){scanf("%d%d",&a[i],&b[i]);}for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}printf("%lld",rez);} ^ user.cpp:5:507: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("hacker3.in","r",stdin);freopen("hacker3.out","w",stdout);int n,x,y,ct;scanf("%d",&n);ct=n/2;long long rez;int a[ct+5];int b[ct+5];for(int i=1;i<=n;i++){scanf("%d%d",&x,&y);if(i>ct){a[i-ct]=x;b[i-ct]=y;}}if(n%2==1){rez=min(b[ct+1],a[ct+1]);for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}else{rez=min(b[ct],a[ct]);for(int i=ct-1;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}}b[ct+1]=rez;fclose(stdin);freopen("hacker3.in","r",stdin);scanf("%d",&n);for(int i=1;i<=ct;i++){scanf("%d%d",&a[i],&b[i]);}for(int i=ct;i>=1;i--){rez=min(rez+b[i],2*rez+a[i]);}printf("%lld",rez);} ^