Compilare: main.cpp: In function 'void solve()': main.cpp:29:25: warning: left operand of comma operator has no effect [-Wunused-value] for (int j = i + 1; j < n, v[i].second > v[j].first; ++j) ~~^~~ main.cpp: In function 'int main()': main.cpp:43:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linterv.in", "r", stdin); ^ main.cpp:44:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linterv.out", "w", stdout); ^