Compilare: main.cpp: In function 'int main()': main.cpp:22:46: warning: operation on 'st' may be undefined [-Wsequence-point] 22 | k-=sum[j][st]-sum[i-1][st++]; | ~~^~ main.cpp:27:31: warning: operation on 'dr' may be undefined [-Wsequence-point] 27 | k+=sum[j][++dr]-sum[i-1][dr]; | ^~~~