Compilare: user.cpp: In function ‘int main()’: user.cpp:68:28: warning: integer overflow in expression [-Woverflow] for(i = 1; i <= NMAX * NMAX; i++); ^ user.cpp:54:12: warning: unused variable ‘x’ [-Wunused-variable] int i, x, y; ^ user.cpp:54:15: warning: unused variable ‘y’ [-Wunused-variable] int i, x, y; ^ user.cpp:57:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inputFile.c_str(), "r", stdin); ^ user.cpp:58:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outputFile.c_str(), "w", stdout); ^ user.cpp:61:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:64:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &P[i].first, &P[i].second); ^