Compilare: user.cpp: In function ‘int main()’: user.cpp:88:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("nogame.in","r",stdin); ^ user.cpp:89:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("nogame.out","w",stdout); ^ user.cpp:90:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:94:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:97:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int k=1;k<=n;k++) scanf("%d",&a[j][k]); ^ user.cpp: In function ‘void construct(int)’: user.cpp:57:21: warning: array subscript is above array bounds [-Warray-bounds] b[5][j]=(b[5][j-1]|a[i][j])^a[i][j]; ^ user.cpp:57:12: warning: array subscript is above array bounds [-Warray-bounds] b[5][j]=(b[5][j-1]|a[i][j])^a[i][j]; ^ user.cpp:58:25: warning: array subscript is above array bounds [-Warray-bounds] b[6][j]=nott(b[6][j-1]^a[i][j]); ^ user.cpp:58:12: warning: array subscript is above array bounds [-Warray-bounds] b[6][j]=nott(b[6][j-1]^a[i][j]); ^ user.cpp:59:25: warning: array subscript is above array bounds [-Warray-bounds] b[7][j]=nott(b[7][j-1]|a[i][j]); ^ user.cpp:59:12: warning: array subscript is above array bounds [-Warray-bounds] b[7][j]=nott(b[7][j-1]|a[i][j]); ^ user.cpp:50:42: warning: iteration 4u invokes undefined behavior [-Waggressive-loop-optimizations] for(int j=1;j<=7;j++) b[j][1]=a[i][1]; ^ user.cpp:50:5: note: containing loop for(int j=1;j<=7;j++) b[j][1]=a[i][1]; ^