Compilare: main.cpp: In function 'void solveOne(int, int, int)': main.cpp:63:19: warning: unused variable 'j' [-Wunused-variable] register int i, j ; ^ main.cpp: In function 'int solveForMedium(int, int, int, int)': main.cpp:98:19: warning: unused variable 'j' [-Wunused-variable] register int i, j ; ^ main.cpp: In function 'int main()': main.cpp:157:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d", &query) ; ^ main.cpp:158:48: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d %d %d %d", &n, &m, &k1, &k2) ; ^ main.cpp:162:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d", &mat[j][i]) ; ^