Compilare: main.cpp: In function 'int main()': main.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= n; i++) { ~~^~~~ main.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; i++) { ~~^~~~ main.cpp:17:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j <= n; j++) { ~~^~~~ main.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= n - 1; i++) { ~~^~~~~~~~ main.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; i + j <= n; j++) { ~~~~~~^~~~