Compilare: main.cpp: In function 'int main()': main.cpp:69:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(y2!=0) if(sumlin[x1]!=sumcol[y1]) swap(y1,y2); ^ main.cpp:47:23: warning: iteration 10004 invokes undefined behavior [-Waggressive-loop-optimizations] if(frecv[i]>maxim) ~~~~~~~^ main.cpp:45:22: note: within this loop for(int i=1;i<=nr;i++) ~^~~~ main.cpp:85:38: warning: 'y2' may be used uninitialized in this function [-Wmaybe-uninitialized] rasp1=magic_sum-sumcol[y1]+a[x1][y1]; ~~~~~~~~~^ main.cpp:69:47: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] if(y2!=0) if(sumlin[x1]!=sumcol[y1]) swap(y1,y2); ~~~~~~~~~^ main.cpp:85:48: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized] rasp1=magic_sum-sumcol[y1]+a[x1][y1]; ~~~~~~~~^ main.cpp:80:48: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized] rasp1=magic_sum-sumlin[x1]+a[x1][y1]; ~~~~~~~~^