Compilare: main.cpp: In function 'int main()': main.cpp:2:145: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] using namespace std;int main(){FILE *fin,*fout;int t,n,q,i,j,ma,mb,x,y;fin=fopen("fifty.in","r");fout=fopen("fifty.out","w");fscanf(fin,"%d",&t);for(i=0;i<t;i++){fscanf(fin,"%d%d",&n,&q);ma=mb=0;for(j=0;j<q;j++){fscanf(fin,"%d%d",&x,&y);if(ma<x)ma=x;if(mb<y)mb=y;}if(ma+mb>n)fprintf(fout,"-1");else{for(j=0;j<ma;j++)fputc('a',fout);for(;j<n;j++)fputc('b',fout);}fputc('\n',fout);}fclose(fin);fclose(fout);return 0;} ^ main.cpp:2:187: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] using namespace std;int main(){FILE *fin,*fout;int t,n,q,i,j,ma,mb,x,y;fin=fopen("fifty.in","r");fout=fopen("fifty.out","w");fscanf(fin,"%d",&t);for(i=0;i<t;i++){fscanf(fin,"%d%d",&n,&q);ma=mb=0;for(j=0;j<q;j++){fscanf(fin,"%d%d",&x,&y);if(ma<x)ma=x;if(mb<y)mb=y;}if(ma+mb>n)fprintf(fout,"-1");else{for(j=0;j<ma;j++)fputc('a',fout);for(;j<n;j++)fputc('b',fout);}fputc('\n',fout);}fclose(fin);fclose(fout);return 0;} ^ main.cpp:2:237: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] using namespace std;int main(){FILE *fin,*fout;int t,n,q,i,j,ma,mb,x,y;fin=fopen("fifty.in","r");fout=fopen("fifty.out","w");fscanf(fin,"%d",&t);for(i=0;i<t;i++){fscanf(fin,"%d%d",&n,&q);ma=mb=0;for(j=0;j<q;j++){fscanf(fin,"%d%d",&x,&y);if(ma<x)ma=x;if(mb<y)mb=y;}if(ma+mb>n)fprintf(fout,"-1");else{for(j=0;j<ma;j++)fputc('a',fout);for(;j<n;j++)fputc('b',fout);}fputc('\n',fout);}fclose(fin);fclose(fout);return 0;} ^