sume2.cpp: In function 'int main()': sume2.cpp:74: warning: comparison between signed and unsigned integer expressions sume2.cpp:86: warning: comparison between signed and unsigned integer expressions sume2.cpp:96: warning: comparison between signed and unsigned integer expressions sume2.cpp:103: warning: comparison between signed and unsigned integer expressions sume2.cpp:100: warning: label 'std' defined but not used sume2.cpp:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sume2.cpp:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sume2.cpp:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result