Compilare: main.cpp: In function 'int main()': main.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:38:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:51:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:87:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=st; i<=dr; i++) ~^~~~ main.cpp:92:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2; i<=n; i++) ~^~~ main.cpp:94:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[i][j] >= cate && dp[i][j] >= dp[i][j+1]) ~~~~~~~~^~~~~~~ main.cpp:37:19: warning: unused variable 'maxi' [-Wunused-variable] long long int maxi = -1; ^~~~