Compilare: user.cpp: In function ‘int main()’: user.cpp:10:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^ user.cpp:11:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j)in>>a[i][j]; ^ user.cpp:12:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2;j<=m;++j)b[1][j]=a[1][j]+a[1][1]; ^ user.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2;j<=m;++j) ^ user.cpp:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=3;i<=n;++i) ^ user.cpp:23:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j) ^ user.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j) ^ user.cpp:38:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j!=c)b[i][j]=a[i][j]+a[i-1][j]+min1; ^ user.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m-1;++j) ^ user.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^ user.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j)cout<<b[i][j]<<" "; ^