Compilare: main.cpp: In function 'll acid_ftalic(int)': main.cpp:20:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<interval>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i=0; i<range[val].size(); i++) { | ~^~~~~~~~~~~~~~~~~~ main.cpp:31:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<interval>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i=0; i<range[val].size(); i++) { | ~^~~~~~~~~~~~~~~~~~