Compilare: main.cpp: In function 'void Solve(int, int, int)': main.cpp:20:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == n) return; ~~^~~~ main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[i+1][j] >= k) ~~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:50:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) ~^~~ main.cpp:99:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=st; i<=dr; i++) ~^~~~ main.cpp:49:19: warning: unused variable 'maxi' [-Wunused-variable] long long int maxi = -1; ^~~~