Eroare de compilare: main.cpp: In function 'int main()': main.cpp:18:9: error: redeclaration of 'int ans' int ans=sp[1][1]; ^~~ main.cpp:10:21: note: 'int ans' previously declared here int n,m,i,j,k,l,ans; ^~~ main.cpp:24:84: error: 'max' was not declared in this scope ans=max(ans,sp[x2][y2]-sp[x2][y1-1]-sp[x1-1][y1]+sp[x1-1][y1-1]); ^ main.cpp:10:11: warning: unused variable 'm' [-Wunused-variable] int n,m,i,j,k,l,ans; ^ main.cpp:10:17: warning: unused variable 'k' [-Wunused-variable] int n,m,i,j,k,l,ans; ^ main.cpp:10:19: warning: unused variable 'l' [-Wunused-variable] int n,m,i,j,k,l,ans; ^ main.cpp:8:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("joctv.in","r",stdin); ^ main.cpp:9:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("joctv.out","w",stdout); ^ main.cpp:11:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:15:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&mat[i][j]); ^ Non zero exit status: 1