Compilare: main.cpp: In function 'int get_id(Line)': main.cpp:118:9: warning: unused variable 'i' [-Wunused-variable] int i, hsh; ^ main.cpp: In function 'int main()': main.cpp:163:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < medi.size(); i = j) ~~^~~~~~~~~~~~~ main.cpp:165:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = i; j < medi.size(); j++) ~~^~~~~~~~~~~~~ main.cpp:174:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<Line>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", ans.size()); ^ main.cpp:133:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dmg.in","r",stdin); ^ main.cpp:134:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dmg.out","w",stdout); ^ main.cpp:135:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:138:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &P[i].x, &P[i].y); ^