Compilare: user.cpp: In function ‘int main()’: user.cpp:26:75: warning: statement has no effect [-Wunused-value] if(a[1][1]<H&&a[1][1]) if(a[1][2]==0||a[2][1]==0) {g<<a[1][1]<<" ";a[1][1]==0; nr++;} ^ user.cpp:27:77: warning: statement has no effect [-Wunused-value] if(a[N][1]<H&&a[N][1]) if(a[N][2]==0||a[N-1][1]==0) {g<<a[N][1]<<" ";a[N][1]==0; nr++;} ^ user.cpp:28:77: warning: statement has no effect [-Wunused-value] if(a[1][M]<H&&a[1][M]) if(a[2][M]==0||a[1][M-1]==0) {g<<a[1][M]<<" ";a[1][M]==0; nr++;} ^ user.cpp:29:80: warning: statement has no effect [-Wunused-value] if(a[N][M]<H&&a[N][M]) if(a[N][M-1]==0||a[N-1][M]==0) {g<<a[N][M]<<" ";a[N][M]==0; nr++;} ^