Compilare: main.cpp: In function 'bool suprapune(interval*, unsigned int, interval)': main.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nr;i++) ~^~~ main.cpp: In function 'int main()': main.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;i++) ~^~ main.cpp:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;i++) ~^~