concurs4.cpp: In function 'int main()': concurs4.cpp:21: warning: format '%d' expects type 'int*', but argument 2 has type 'long int*' concurs4.cpp:21: warning: format '%d' expects type 'int*', but argument 3 has type 'long int*' concurs4.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result concurs4.cpp:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result concurs4.cpp:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result