Compilare: main.cpp: In function 'int main()': main.cpp:313:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<Points.size(); i++){ ~^~~~~~~~~~~~~~ main.cpp:321:9: warning: unused variable 'cnt' [-Wunused-variable] int cnt=0; ^~~ main.cpp:303:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("grau.in", "r", stdin); ^ main.cpp:304:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("grau.out", "w", stdout); ^ main.cpp:306:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:309:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp:320:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ main.cpp:324:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &op, &x, &y); ^