Compilare: main.cpp: In function 'int main()': main.cpp:16:19: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 16 | for(int i=1; i<=n; ++i) | ~^~~ main.cpp:27:9: warning: statement has no effect [-Wunused-value] 27 | for(i; i<=n-1; ++i) | ^ main.cpp:40:9: warning: statement has no effect [-Wunused-value] 40 | for(i; i<=n; ++i) | ^ main.cpp:54:9: warning: statement has no effect [-Wunused-value] 54 | for(i; i<=n; ++i) | ^