Compilare: main.cpp: In function 'int main()': main.cpp:106:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(point<v.size()&&v[point].x==i&&v[point].y==j) ~~~~~^~~~~~~~~ main.cpp: In function 'bool cmmdc(int, int)': main.cpp:47:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:63:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&n,&m,&q); ^ main.cpp:66:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d%d",&ax,&by,&bx,&ay); ^