Compilare: main.cpp: In function 'int main()': main.cpp:3:117: warning: unused variable 'x' [-Wunused-variable] using namespace std;FILE *f=fopen("sume.in","r");FILE *g=fopen("sume.out","w");int main(){int i,v[25001],w[25001],n,x,m,p,s1=0,s2=0;fscanf(f,"%d",&n);for(i=1;i<=n;i++){fscanf(f,"%d",&v[i]);s1=s1+v[i];}m=sqrt(2*n)+1;w[1]=(v[1]+v[2]-v[m])/2;s2=w[1];for(i=2;i<=m;i++){w[i]=v[i-1]-w[1];s2=s2+w[i];}if(s1%s2!=0)fprintf(g,"-1");else{fprintf(g,"%d\n",m);for(i=1;i<=m;i++)fprintf(g,"%d ",w[i]);}} ^ main.cpp:3:121: warning: unused variable 'p' [-Wunused-variable] using namespace std;FILE *f=fopen("sume.in","r");FILE *g=fopen("sume.out","w");int main(){int i,v[25001],w[25001],n,x,m,p,s1=0,s2=0;fscanf(f,"%d",&n);for(i=1;i<=n;i++){fscanf(f,"%d",&v[i]);s1=s1+v[i];}m=sqrt(2*n)+1;w[1]=(v[1]+v[2]-v[m])/2;s2=w[1];for(i=2;i<=m;i++){w[i]=v[i-1]-w[1];s2=s2+w[i];}if(s1%s2!=0)fprintf(g,"-1");else{fprintf(g,"%d\n",m);for(i=1;i<=m;i++)fprintf(g,"%d ",w[i]);}} ^ main.cpp:3:150: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] using namespace std;FILE *f=fopen("sume.in","r");FILE *g=fopen("sume.out","w");int main(){int i,v[25001],w[25001],n,x,m,p,s1=0,s2=0;fscanf(f,"%d",&n);for(i=1;i<=n;i++){fscanf(f,"%d",&v[i]);s1=s1+v[i];}m=sqrt(2*n)+1;w[1]=(v[1]+v[2]-v[m])/2;s2=w[1];for(i=2;i<=m;i++){w[i]=v[i-1]-w[1];s2=s2+w[i];}if(s1%s2!=0)fprintf(g,"-1");else{fprintf(g,"%d\n",m);for(i=1;i<=m;i++)fprintf(g,"%d ",w[i]);}} ^ main.cpp:3:189: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] using namespace std;FILE *f=fopen("sume.in","r");FILE *g=fopen("sume.out","w");int main(){int i,v[25001],w[25001],n,x,m,p,s1=0,s2=0;fscanf(f,"%d",&n);for(i=1;i<=n;i++){fscanf(f,"%d",&v[i]);s1=s1+v[i];}m=sqrt(2*n)+1;w[1]=(v[1]+v[2]-v[m])/2;s2=w[1];for(i=2;i<=m;i++){w[i]=v[i-1]-w[1];s2=s2+w[i];}if(s1%s2!=0)fprintf(g,"-1");else{fprintf(g,"%d\n",m);for(i=1;i<=m;i++)fprintf(g,"%d ",w[i]);}} ^