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:12:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j)in>>a[i][j]; ^ user.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=m;++i) ^ user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=n;++i) ^ user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j) ^ user.cpp:38:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j) ^ user.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j!=k)x[i][j]=minn+a[i-1][j]+a[i][j]; ^ user.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j) ^ user.cpp:45:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(minn2>x[i][j] && j!=k) ^ user.cpp:51:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=m;++j) ^ user.cpp:53:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j!=k)x[i][j]=min(x[i][j],minn2+a[i][j]); ^