qvect.cpp: In function 'int main()': qvect.cpp:108: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result qvect.cpp:109: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result qvect.cpp:110: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result qvect.cpp:113: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result qvect.cpp:115: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result qvect.cpp:119: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result qvect.cpp: In function 'int SOLVE_1(int, int)': qvect.cpp:21: warning: 'x' may be used uninitialized in this function qvect.cpp:21: warning: 'y' may be used uninitialized in this function qvect.cpp: In function 'int SOLVE_2(int, int)': qvect.cpp:77: warning: 'ans' may be used uninitialized in this function