Compilare: main.cpp: In member function 'bool interval::operator<(const interval&) const': main.cpp:22:37: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if (y < other.y || y == other.y && x > other.x) ~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:76:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < w.size() && w[j].y <= i) { ~~^~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:39:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &L); ^ main.cpp:41:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", & Cost[i]); ^ main.cpp:44:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ main.cpp: In function 'int main()': main.cpp:88:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cover.in", "r", stdin); ^ main.cpp:89:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cover.out", "w", stdout); ^